Category Archives: animals

Episode 088: Megabats and the Ahool

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Our next Halloween monster is the ahool, a mystery bat from Indonesia and Java, but along the way we’ll learn about megabats in general–especially the hammerhead bat! Thanks to Grace, Grace’s sons, and Tania for the hammerhead bat suggestion!

I’ve unlocked a Patreon bonus episode about burrowing bats, which you can listen to here.

A hammerhead bat (male) from side and front. DAT SNOOT. (Photos by Sarah Olson and swiped off the web, because I have no shame.)

The Egyptian fruit bat (Photo by Amram Zabari and swiped etc etc):

Great flying foxes, sleepin (photo by Lars Petersson and swiped etc etc):

Golden-crowned flying fox, flyin (photo by Dave Irving and swiped etc etc):

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

This week we’re going to learn about bats—some real, some mysterious, and all of them awesome, because bats are awesome! Listeners Grace and Grace’s sons requested an episode about hammerhead bats recently, which made me realize two things. One, I had never actually done a bats episode even though bats are one of my favorite animals, and two, back when listener Tania suggested hammerhead worms and other hammerhead animals, I totally forgot hammerhead bats were a thing!

As a special Halloween treat, I’ve unlocked a Patreon episode about burrowing bats that anyone can now listen to. I’ll put a link in the show notes, which you can click to listen on your browser. You don’t need a Patreon login or anything.

Bats are grouped into two basic types, microbats and megabats. Microbats are typical bats, usually small, flat-faced with big ears, that use echolocation to catch insects at night. Megabats are typically larger, with limited echolocation abilities and longer muzzles, and they often eat fruit. They’re sometimes called fruit bats collectively. We’re going to focus on megabats in this episode.

Let’s start with the hammerhead bat. It lives in parts of Africa near the equator, in forests and swamps, and mostly eats fruit. It especially likes figs. So do I, big flappy bat friend. It’s a big bat, with a wingspan over three feet wide, or 97 cm. Males are larger than females, and males tend to fly farther to find fruit while females generally stick to areas they know.

During the day the hammerhead bat roosts high up in trees. Researchers think it’s nocturnal mostly because it tends to overheat while flying. Naturally it prefers to nap when it’s hottest out and is only active at night when it’s cooler.

The hammerhead bat’s body is furry, with leathery wings and a mostly bare nose, although it also has long whiskers. Its fur is mostly brown or gray-brown, but its shoulders are white and it has a tuft of white fur at the base of its ears. Its tail is short and its eyes are large.

Most of what a hammerhead bat does is typical for other fruit bats. But it differs from other fruit bats in a big way. The hammerhead bat gets its name from the male’s face, which looks sort of mooselike with a big snoot, big lips, cheek pouches, a split lower lip, and a larynx that’s really big for the size of the throat. All these features allow the male hammerhead bat to make really loud honking noises to attract females. Females have smaller faces that resemble a fox or dog rather than a moose.

Often, males gather at night to honk and flap their massive wings, showing off for the females. Females fly around, checking the males out and probably giggling with each other about which ones they like best and who’s got the best voice.

This is what the hammerhead bat sounds like, although it’s not a great audio clip. At least it gives you an idea of what these bats sound like:

[hammerhead bats honking]

There are reports of the hammerhead bat attacking chickens and other birds to eat them. Fruit isn’t all that high in protein, so it could be that a bat occasionally needs nutrients it can’t get from its usual diet. This is not that uncommon in herbivorous animals, as it happens. Cows will occasionally eat chickens, deer and sheep will eat baby birds when they find them, and so forth.

Fruit bats of all kinds also visit mineral licks, especially pregnant females. But researchers have found that fruit bats don’t actually need those trace minerals. Fruit is rich in minerals. Researchers think the mineral-rich clay actually acts as a detoxifier for the bats, helping reduce the toxic effects of secondary plant compounds—leaves and unripe sections of the fruit, and so forth—that the bats eat every night that could otherwise make them sick.

Not a whole lot is known about the hammerhead bat or other megabats, for that matter. A recent discovery about how fruit bats navigate in the darkness suggests they actually use a rudimentary form of echolocation, but it’s very different from the echolocation used by microbats. For one thing, the clicking sounds they make aren’t vocalizations, they’re produced by the wings as the bat flies. For another, while the echolocation does help bats navigate, it’s not very accurate. Bats still sometimes crash into things. Researchers think echolocation has evolved separately in bats and that the megabat echolocation is not related to microbat echolocation.

The Egyptian fruit bat uses a more sophisticated version of echolocation, clicking its tongue to produce the signals it uses. It’s a relatively small megabat, with a wingspan of about two feet, or 60 cm, and it eats fruit, especially wild dates. Its echolocation is more like dolphin and whale sonar than microbat echolocation. It also has good eyesight and can easily switch between visual navigation and echolocating depending on how much light it has available.

Fruit bats are amazing flyers. Their wings are modified arms, with the fingers enormously elongated. The fingers are connected with tough but flexible skin called a membrane. Researchers have found that the membrane contains tiny muscles barely thicker than a hair that help the bat fine-tune the stiffness and shape of the membranes. This allows it to fly efficiently and quickly.

Many farmers think megabats destroy fruit crops, so they try to kill or drive off the bats. But while fruit bats do sometimes visit fruit farms, they are most likely to eat overripe fruit that was missed by pickers. This helps keep fungus and insect pests to a minimum, so it’s actually beneficial to fruit farmers. Unfortunately, many people just don’t like bats and blame them for damage to crops that’s actually done by other animals and by birds.

For instance, in Australia the flying fox is blamed for fruit crop destruction and the spreading of the Hendra virus and other diseases. But the flying fox mostly eats blossoms, especially of gum trees, along with insects, leaves, nectar, and some fruit. Birds are much more damaging to orchards. And while all bats can carry diseases, just as all mammals can, it’s not proven that the Hendra virus is spread by flying foxes at all. Domestic cats, on the other hand, do spread the virus. Keep your cats indoors. But the flying fox has been systematically persecuted in Australia for the last century, with several species having gone extinct as a result. This is a shame for many reasons, but especially because fruit bats of all kinds are important to the environment as seed dispersers and pollinators.

The biggest bat alive today is probably the great flying fox, which lives in New Guinea, Indonesia, and other nearby areas. Its wingspan can be nearly six feet across, or 1.8 meters. The golden-crowned flying fox, which lives in the Philippines, is very nearly as large, with a wingspan of over five and a half feet across, or 1.7 meters.

But there are reports of bats much larger than these. And that brings us to the ahool, a monstrous batlike creature reported from Java, Indonesia, and other areas.

The first official report of an animal called the ahool comes from western Java in 1927. Naturalist Dr. Ernst Bartels was in bed but still awake when he heard a loud call that sounded something like “a-hool!” Bartels rushed outside with a flashlight in hopes of seeing what animal had made the call, but he heard it again farther away, then again almost out of earshot.

As it happens, Bartels had grown up in western Java and knew about the legend of the ahool. It was supposed to be a monstrous bat, its wingspan some 12 feet across, or 3.6 meters. Its face was monkey-like with large eyes, and it was supposed to have feet that pointed backwards. During the day it was supposed to live in caves hidden behind waterfalls, but at night it flew out and scooped fish from the river.

Bartels did more research into the ahool legend, and eventually Ivan Sanderson, a cryptozoologist who had his hand in everything back in the day, contacted him with his own account. In 1932 Sanderson said he had seen a gigantic black bat in western Africa one night. He and his companion, naturalist Gerald Russell, had been searching for tortoises in a river when the bat flew over them. They both estimated its wingspan as 12 feet, and Sanderson said he could even see the sharp teeth in its open mouth.

Now, I can’t help but be skeptical of Sanderson’s sighting just because Sanderson was always having remarkable cryptozoological sightings with no proof but his own say-so. No one’s that lucky and unlucky at the same time. Dude should have carried a camera with him at all times, you know? Also, Bartels’ story was documented by Sanderson and is therefore a little bit suspect too.

But the ahool is an interesting cryptid because its description sounds so plausible. Even the backwards feet make sense, as bat feet have evolved to allow bats to hang upside down easily, which means when they’re right side up, their feet do appear to be backwards.

There are some discrepancies, though. Megabats all have long muzzles compared to microbats. The ahool is specifically described as having a flat face like a human or a monkey. While megabats aren’t all 100% frugivorous—that is, they don’t all eat nothing but fruit—none of them are known to eat fish. Some microbats do specialize in catching fish, though, and those bats all have longer snouts than typical insectivorous bats, although not as long as megabat snouts. And the ahool is said to stand or sit upright on the ground occasionally. While microbats sometimes do stand upright, megabats never do.

Sanderson proposed that the ahool may actually be an enormous microbat. Some microbats are actually pretty big, including the carnivorous ghost bat, also called the false vampire bat, which lives in parts of northern Australia. Its wingspan is almost 20 inches, or 50 cm. This is much larger than the smallest megabat, the spotted-winged fruit bat, which has a wingspan of only 11 inches, or 28 cm.

But microbats don’t make a lot of noise. It’s megabats who honk and call to each other rather than just squeaking. The ahool is supposedly named for its loud cry, the one Bartels heard. And remember that Bartels never saw the animal he heard.

So we have a few possibilities here.

Possibility one: the ahool is a real animal, exactly or mostly as described, with aspects of both megabats and microbats. It’s either incredibly rare or extinct these days, which would explain why there aren’t more sightings. If this is the case, it’s undoubtedly an animal completely new to science.

Possibility two: the ahool is a real animal, but it’s not well known because it’s so seldom seen. It seems to be a mixture of microbat and megabat because people who saw it made assumptions of its appearance based on what they know about bats. But some of those details are from microbats and some from megabats, and the actual animal may not look anything like its description in folklore. In this case, it’s probably a megabat.

Possibility three: the ahool is an animal entirely of folklore and myth, described as similar to various bats familiar to locals but enormously large. In this case, the myth may have grown up around the call, if the ahool’s call is that of a rare or migratory bird, seldom heard and therefore mysterious.

I can’t even make a guess as to which possibility might be the most likely, and that’s pretty awesome.

Let’s go back to the hammerhead bat for another mystery. A few years ago people started pointing out that the hammerhead bat looked a lot like drawings of the Jersey Devil, a cryptid supposedly seen in the southern New Jersey pine barrens. Newspaper accounts of the Jersey devil started circulating in the early years of the 20th century, although it may have been an established folktale before then. It’s usually described as having the head of a goat, bat wings, cloven hooves, and a forked tail, although its description varies from story to story. It’s more of an urban legend than a real cryptozoological mystery, to be honest. In 1909 a couple of guys bought a circus kangaroo, glued fake bat wings on it, and claimed they’d captured the Jersey devil.

So could someone have brought a male hammerhead bat to New Jersey and released it, where it subsequently inspired reports of the Jersey devil? I’m going to say no. The hammerhead bat can’t survive in cold weather, and if temperatures drop below 55 degrees F, or about 13 degrees C, it can’t even fly. Even if someone had captured one and somehow managed to keep it alive during the journey from equatorial Africa, how and why did it end up in the pine barrens of New Jersey? A bat that big would have excited comment even if only glimpsed in a cage on the docks, and would probably have been a big draw in traveling menageries. But there are no records of any giant bats in the area, and the theory that the Jersey devil was inspired by a hammerhead bat is a modern one. It’s still pretty cool, though.

Because bats are nocturnal and look scary, a lot of superstitions have grown up around them. Some cultures consider bats lucky, some unlucky. Some say you have to kill a bat to cancel out its bad luck, some say harming a bat will bring bad luck. But bats would avoid people completely if they could, and you don’t have anything to fear from them, not even bad luck.

I mean, except for the kind that can turn into actual vampires. Those are scary. Fortunately they only exist in horror movies.

You can find Strange Animals Podcast online at strangeanimalspodcast.com. We’re on Twitter at strangebeasties and have a facebook page at facebook.com/strangeanimalspodcast. If you have questions, comments, or suggestions for future episodes, email us at strangeanimalspodcast@gmail.com. If you like the podcast and want to help us out, leave us a rating and review on Apple Podcasts or whatever platform you listen on. We also have a Patreon if you’d like to support us that way.

Thanks for listening!

Episode 087: Globsters

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It’s October! Let the spooky monster episodes begin! This week we’re starting off with a bang–or maybe a squoosh–with an episode about globsters. What are they? Why do they look like that? Do they smell?

Yes, they smell. They smell so bad.

Trunko, a globster found in South Africa:

A whale shark:

The business end of a whale shark:

A globster found in Chile:

A globster found in North Carolina after a hurricane:

A globster that still contains bones:

Not precisely a globster but I was only a few weeks late in my 2012 visit to Folly Beach to see this thing:

Further reading:

Hunting Monsters by Darren Naish

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

It’s October, and you know what that means! Monsters! …and have I got a creepy monster for you this week. Grab your Halloween candy and a flashlight while I tell you about something called a globster.

If you live near the seashore, or really if you’ve spent any time at all on the beach, you’ll know that stuff washes ashore all the time. You know, normal stuff like jellyfish that can sting you even though they’re dead, pieces of debris that look an awful lot like they’re from shipwrecks, and the occasional solitary shoe with a skeleton foot inside. But sometimes things wash ashore that are definitely weird. Things like globsters.

A globster is the term for a decayed animal carcass that can’t be identified without special study. Globsters often look like big hairy blobs, and are usually white or pale gray or pink in color. Some don’t have bones, but some do. Some still have flippers or other features, although they’re usually so decayed that it’s hard to tell what they really are. And they’re often really big.

Let’s start with three accounts of some of the most famous globsters, and then we’ll discuss what globsters might be and why they look the way they do.

The St. Augustine monster was found by two boys bicycling on Anastasia Island off the coast of Florida in November 1896. It was partially buried in sand, but after the boys reported their finding, people who came to examine it eventually dug the sand away from the carcass. It was 21 feet long, or almost 6.5 meters, 7 feet wide, or just over 2 meters, and at its tallest point, was 6 feet tall, or 1.8 meters. Basically, though, it was just a huge pale pink lump with stumpy protrusions along the sides.

A local doctor, DeWitt Webb, was one of the first people to examine the carcass. He thought it might be the rotten remains of a gigantic octopus and described the flesh as being rubbery and very difficult to cut. Another witness said that pieces of what he took to be parts of the tentacles were also strewn along the beach, separated from the carcass itself.

Dr. Webb sent photographs and notes to a cephalopod expert at Yale, Addison Verrill. He at first thought it might be a squid, but later changed his mind and decided it must be an octopus of enormous proportions—with arms up to 100 feet in length, or over 30 meters.

In January a storm washed the carcass out to sea, but the next tide pushed it back to shore two miles away. Webb sent samples to Verrill, who examined them and decided it was more likely the remains of a sperm whale than a cephalopod.

In 1924, off the coast of South Africa, witnesses saw a couple of orcas apparently fighting a huge white monster covered with long hair—far bigger than a polar bear. It had an appendage on the front that looked like a short elephant trunk. Witnesses said the animal slapped at the orcas with its tail and sometimes reared up out of the water. This went on for three hours.

The battle was evidently too much for the monster, and its corpse washed ashore the next day. It measured 47 feet long in all, or 14.3 meters, and the body was five feet high at its thickest, or 1.5 meters. Its tail was ten feet long, or over three meters, and its trunk was five feet long and over a foot thick, or about 35 cm. It had no legs or flippers. But the oddest thing was that it didn’t seem to have a head either, and there was no blood on the fur or signs of fresh wounds on the carcass.

The carcass was so heavy that a team of 32 oxen couldn’t move it. The reason someone tried to move it was because it stank, and the longer it lay on the beach the more it smelled.

Despite its extraordinary appearance, no scientists came to investigate. After ten days, the tide carried it back out to sea and no one saw it again. Zoologist Karl Shuker has dubbed it Trunko and has written about it in several of his books.

Another globster was discovered well above ordinary high tide on a Tasmanian beach in 1960 after a massive storm. It was 20 feet long, or 6 meters, 18 feet wide, or 5.5 meters, and about 4 ½ feet high at its thickest, or 1.4 meters. It stayed on the beach for at least two years without anyone being especially interested in it. It was in a fairly remote area, admittedly. It wasn’t until 1962 that a team of zoologists examined it. They reported that it was ivory-colored, incredibly tough, boneless, and without any visible eyes. The lump had four large lobes, but it also appeared to have gill slits. One of the zoologists suggested it might be an enormous stingray.

So what were these three globsters?

Let’s look at Trunko first. Shuker points out that when a shark decomposes, it can take on a hairy appearance due to exposed connective tissue fibers. But Trunko was fighting two orcas only hours before it washed ashore.

OR WAS IT??

Here’s the thing. No one saw the fight from up close and orcas are well known to play with their food. There’s a very good chance that Trunko was already long dead and that the orcas came across it and batted it around in a monstrous game of water volleyball. That would also explain why there was no blood associated with the corpse.

In that case, was Trunko a dead shark? At nearly 50 feet long, it would have had to be the biggest shark alive…and as it happens, there is a shark that can reach that length. It’s called the whale shark, which tops out at around 46 feet, or 14 meters, although we do have unverified reports of individuals nearly 60 feet long, or 18 meters—or even longer.

Like the megamouth shark, the whale shark is a filter feeder and its mouth is enormous, some five feet wide, or 1.5 meters. But the interior of its throat is barely big enough to swallow a fish. Its teeth are tiny and useless. Instead, it has sieve-like filter pads that it uses to filter tiny plants and animals from the water, including krill, fish eggs and larvae, small fish, and copepods. The filter pads are black and are probably modified gill rakers. The whale shark either gulps in water or swims forward with its mouth open, and water flows over the filter pads before flowing out through the gills. Tiny animals are directed toward the throat so the shark can swallow them.

The whale shark is gray with light yellow or white spots and stripes, and three ridges along each side. Its sandpaper-like skin is up to four inches thick, or 10 cm. It has thick, rounded fins, especially its dorsal fin, and small eyes that point slightly downward. It usually stays near the surface but it can dive deeply too, and it’s a fast swimmer despite its size. Females give birth to live babies which are a couple of feet long at birth, or 60 cm. While no one has watched a whale shark give birth, researchers think a shark may be pregnant with hundreds of babies at a time, but they mature at different rates and only a few are born at once.

The whale shark isn’t dangerous to humans at all, but humans are dangerous to whale sharks. It’s a protected species, but poachers kill it for its fins, skin, and oil.

The whale shark usually lives in warm water, especially in the tropics, but occasionally one is spotted in cooler areas. They’re well known off the coast of South Africa. If the Trunko globster was a dead whale shark, the “trunk” was probably the tapered end of the tail, with the flukes torn or rotted off. Most likely the jaws had rotted off as well, leaving no sign that the animal had a head or even which end the head should be on.

But sharks aren’t the only big animals in the ocean, and the skin and blubber of a dead whale can also appear furry once it’s broken down sufficiently due to the collagen fibers within it. Collagen is a connective tissue and it’s incredibly tough. It can take years to decay. Tendons, ligaments, and cartilage are mostly collagen, as are bones and blubber.

While we don’t know what Trunko really was, many other globsters that have washed ashore in modern times have been DNA tested and found to be whales. In 1990 the Hebrides blob washed ashore in Scotland. It was 12 feet long, or 3.7 meters, and appeared furry, with a small head at one end and finlike shapes along its back. Despite its weird appearance, DNA analysis revealed it was a sperm whale, or at least part of one. Another sperm whale revealed by DNA testing was the Chilean blob, which washed ashore in Los Muermos, Chile in 2003. It was 39 feet long, or 12 meters.

As for the tissue samples of the St Augustine monster, they still exist, and they’ve been studied by a number of different people with conflicting results. In 1971, a cell biologist from the University of Florida reported that it might be from an octopus. Cryptozoologist Roy Mackal, who was also a biochemist, examined the samples in 1986 and also thought the animal was probably an octopus. A more sophisticated 1995 analysis published in the Biological Bulletin reported that the samples were collagen from a warm-blooded vertebrate—in other words, probably a whale. The same biologist who led the 1995 analysis, Sidney Pierce, followed up in 2004 with DNA and electron microscope analyses of all the globster samples he could find. Almost all of them turned out to be remains of whale carcasses, of various different species. This included the Tasmanian globster.

Sometimes a globster is pretty obviously a whale, but one with a bizarre and unsettling appearance. The Glacier Island globster of 1930, for instance, was found floating in Eagle Bay in Alaska, surrounded by icebergs from the nearby Columbia Glacier. The head and tail were skeletal, but the rest of the body still had flesh on it, although it appeared to be covered with white fur. Its head was flattish and triangular and the tail was long. The men who found the carcass thought it had been frozen in the glacier’s ice.

They hacked the remaining flesh off to use as fishing bait, but they saved the skeleton. A small expedition of foresters came to examine the skeleton, which they measured at 24 feet and one inch, or over 7.3 meters. They identified it as a minke whale. The skeleton was eventually mounted and put on display in a traveling show, advertised as a prehistoric monster found frozen in a glacier. In 1931 the skeleton was donated to the National Museum of Natural History in Washington DC, where it remains in storage. Modern examinations confirm that it’s a minke whale.

On March 22, 2012, a rotting corpse 15 feet long, or 4.6 meters, with armor-like scutes along the length of its body, washed ashore on Folly Beach in South Carolina. This isn’t exactly a globster, since it was still fish-shaped, but I’m including it because I was literally at Folly Beach a matter of weeks after this thing washed ashore. I wish I’d seen it. It turned out that it wasn’t a sea monster as people assumed, but a rare Atlantic sturgeon.

Many globsters have stumps that look like the remains of flippers, legs, or tentacles. The Four Mile Globster that washed ashore on Four Mile Beach, Tasmania in 1998 had protrusions along its sides that looked like stumpy legs. It was 15 feet long, or 4.6 meters, and 6 feet wide, or 1.8 meters, with white hair and flippers that were separate from the protrusions. We don’t actually know for sure what this globster was.

In 1988 a treasure hunter found a globster now called the Bermuda blob. It was about eight feet long, or almost 2.5 meters, pale and hairy with what seemed to be five legs. The discoverer took samples of the massively tough hide, which were examined by Sidney Pierce in his team’s 1995 study of globster remains. This was one of the few that turned out to be from a shark instead of a whale, although we don’t know what species.

But sharks don’t have five legs. And the Four Mile Globster had six stumps that were separate from the flippers still visible on the carcass. So what causes these leg-like protrusions? They’re probably flesh and blubber stiffened inside with a bone or part of a bone, such as a rib. As the carcass is washed around by the ocean, the flesh tears in between the bones, making them look like stumps of appendages.

There’s a good reason why so many globsters turn out to be sperm whale carcasses. A sperm whale’s massive forehead is filled with waxy spermaceti oil. The upper portion of the head contains up to 500 gallons of oil in a cavity surrounded by tough collagen walls. Researchers hypothesize that this oil is used both for buoyancy and to increase the whale’s echolocation abilities. The lower portion of the forehead contains cartilage compartments filled with more oil, which may act as a shock absorber since males in particular ram each other when they fight. So much of the head of a sperm whale, which can be as big as 1/3 of the length of the whale, is basically a big mass of cartilage and connective tissue. After a whale dies, this buoyant section of the body can separate from the much heavier skeleton and float away on its own.

Globsters aren’t a modern phenomenon, either. We have written accounts of what were probably globsters dating back to the 16th century, and older oral traditions from folklore around the world. The main problem with globsters is that they’re not usually studied. They smell bad, they look gross, and they may not stay on the beach for long before the tide washes them back out to sea. For instance, after Hurricane Fran passed through North Carolina in 1996, a group of young men found a globster washed up on a beach on Cape Hatteras. They took pictures and estimated its length as twenty feet long, or six meters, six feet wide, or 1.8 meters, and four feet high at its thickest, or 1.2 meters. From the pictures it’s pretty disgusting, like a lump of meat with intestines or tentacles hanging from it. But the men weren’t supposed to be on the beach, which was part of the Cape Hatteras National Park and closed due to hurricane damage. They didn’t mention their find to anyone until the following year, when one of the men learned about the St Augustine Monster in his college biology class. By then, of course, the Cape Hatteras globster was long gone. While it might have been a rotting blob of whale blubber or a piece of dead shark, we don’t know for sure. So if you happen to find a globster on a beach, make sure to tell a biologist or park ranger so they can examine it…before it’s lost to science forever.

You can find Strange Animals Podcast online at strangeanimalspodcast.com. We’re on Twitter at strangebeasties and have a facebook page at facebook.com/strangeanimalspodcast. If you have questions, comments, or suggestions for future episodes, email us at strangeanimalspodcast@gmail.com. If you like the podcast and want to help us out, leave us a rating and review on Apple Podcasts or whatever platform you listen on. We also have a Patreon if you’d like to support us that way.

Thanks for listening!

Episode 086: Ammonoids and Nautiloids

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Is it extinct? Is it alive? What is the difference between the ammonite and the nautilus? Did Kate get the two confused her whole life until a few months ago and thought they were both extinct? Maybe.

A fossilized ammonite shell:

Another fossilized ammonite shell of a different shape:

A third fossilized ammonite shell of a yet different shape:

A gigantic fossilized ammonite shell:

A fossilized ammonite shell of gem quality, called an ammolite:

This is what an ammonite might have looked like when it was alive. I drew this myself IN MS PAINT because I couldn’t find anything online I liked. There’s 15 minutes of my life I won’t get back:

This is an alive and not extinct nautilus:

Another alive and not extinct nautilus:

The slimy or crusty nautilus. Look, I don’t make these names up:

A nautilus tucked up in its shell and peeking out to see if that diver is going to eat it:

You can contribute to helping conserve the nautilus:

Save the Nautilus

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

This week let’s learn about two groups of mollusks, ammonoids and nautiloids. One group is extinct, one is still around…but they both look a lot alike, and they’re way more interesting than the word mollusk makes them sound!

We’ll start with ammonoids, specifically ammonites. Ammonites first appear in the fossil record around 409 million years ago, but they died out at the same time as the dinosaurs, around 66 million years ago. Many ammonite fossils look like snail shells, but the shell contains sections inside called chambers. The largest chamber, at the end of the shell, was for the ammonite’s body, except for a thin tube that extended through the smaller inner chambers, which allowed the animal to pump water or air into and out of the chambers in order to make itself more or less buoyant in the water. Some ammonites lived at the bottom of the ocean in shallow water, but many swam or floated throughout the ocean.

Comparing ammonites to snail shells may not give you the right idea about ammonites, though. Even big snails are pretty small. While many ammonites were no larger than modern snails, many others were bigger than your hand, sometimes twice the size of your hand even if you have really big hands. But during the Jurassic and part of the Cretaceous, some ammonites got even bigger. One species grew almost two feet across, or 53 cm, another grew some 4 ½ feet across, or 137 cm, and one species grew as much as 6 ½ feet across, or 2 meters. It was found in Germany in 1895 and dates to about 78 million years ago. And it wasn’t actually a complete fossil. Researchers estimate that in life it would have been something like eight and a half feet across, or 2.55 meters.

We have a lot of ammonite fossils, and many of them are beautifully preserved. Some still show a mother-of-pearl layer, a lustrous, iridescent layer of shell that modern molluscs still form. Some ammonite fossils are so lustrous that they’re considered gems, called ammolites. Ammolites are usually polished and made into jewelry. In the olden days people thought ammonites were petrified snakes, and would sometimes even carve the end of the ammonite shell into a snake’s head.

Many fossil ammonites aren’t fossils of the actual shell. When an ammonite died, its empty shell would fill with sediment. Frequently the shell itself wasn’t preserved, but the sediment inside was. That gives us elaborate casts of the insides of ammonite shells, in such good condition that researchers can determine the internal anatomy of the shell. We know mosasaurs frequently ate ammonites because we have fossils with tooth marks that match mosasaur teeth.

There are so many ammonite fossils that paleontologists can date layers of rock by examining which species of ammonite appear in it, called index fossils. Different species frequently had much different shells, some smooth, some with spines or ridges, with tight coils or open coils. Some didn’t coil at all, and instead were straight or had only one or two bends.

But despite all these thousands upon thousands of ammonite fossils, we still don’t know what the animal’s soft parts looked like. Hardly any impressions of ammonite bodies are preserved, only the shells. But ammonites are related to cephalopods like squid, so researchers believe they probably had tentacles.

Nautiloids are also cephalopods. They’re related to ammonites but not closely, about as closely as they’re related to squid. And nautiloids are still alive.

I only found that out recently. A few months ago I came across a picture of a man holding a big snail-like shell with eyes and a bunch of small tentacle things sticking out of the end. I thought it was photoshopped, because I knew those things were extinct! Then I realized that I’ve had nautilus and ammonite mixed up my whole life, and thought they were both extinct and basically the same animal.

They do look a lot alike. Nautilus shells are smooth and rounded like a snail shell, and like the ammonite, nautilus shells also contain chambers filled with gas that keeps the animal from sinking. The nautilus’s body is in the last chamber and extends outside of the shell, with a pair of simple eyes, a beak-like mouth, and as many as 90 small tentacles around the mouth. The top of the shell is striped with brown, while the bottom is white.

Nautilus tentacles are retractable and don’t have suckers the way other cephalopod tentacles do. They do have ridges and secrete sticky mucus that helps them keep hold of their prey. The nautilus also has tentacles around its eyes that are different from its mouth tentacles, and researchers think they act as sensory organs, detecting scent trails in the water. When a nautilus wants to rest, it holds onto a rock with its mouth tentacles so it won’t drift away.

Like squid, the nautilus has a tongue-like structure called a radula, which is studded with exactly nine teeth that it uses to cut up pieces of its prey, mostly crustaceans. It also eats carrion. Like other cephalopods, the nautilus has blue blood instead of red since it contains hemocyanin instead of hemoglobin. Also like squid and other cephalopods, the nautilus has a siphon, properly called a hyponome. In the nautilus, the hyponome is a flap that’s folded over to form a tube, instead of an actual tube in squid and octopus. The animal sucks in and expels water through the hyponome, which propels it through the ocean. If it’s threatened, the nautilus can actually withdraw all the way into its shell like a snail, covering the entrance with two large, folded tentacles.

The first fossil nautiloids are found in rocks dating to the Cambrian period, some 500 million years ago. Earlier nautiloids are sometimes straight, sometimes slightly curved, and sometimes coiled like ammonite shells. Even so, overall the nautilus hasn’t changed much since the Cambrian. Like the ammonite, some species of nautiloid once reached over 8 feet across, or 2.5 meters.

Today there are only six species of nautilus left, and they’re endangered due to habitat loss, pollution, and poaching. The shells of larger individuals can be worth a few hundred dollars to collectors, and while selling the shells is illegal in many countries, as long as there are unscrupulous or just clueless people who buy the shells, poaching of nautiloids will continue to be a problem. A good rule is that if you’re a tourist and someone is selling any kind of animal part, don’t buy it. Even if you think it’s harmless, you might be contributing to the extinction of an animal—plus, it’s probably going to get confiscated by customs anyway.

The problem is that the nautilus matures very slowly. It lives to be over 20 years old, but it isn’t mature until it’s about 15 years old. Its eggs take a long time to hatch too. So the nautilus is slow to recover from overhunting, which makes it vulnerable to extinction.

One species of nautilus is so rare it’s only been seen a few times, and hadn’t been seen in more than 30 years until one was spotted in 2015 off the coast of Papua New Guinea. It’s called Allonautilus scrobiculatus, and unlike other nautilus species, its shell is covered with a thick coating of hairy slime that gives it its popular name, the slimy nautilus or crusty nautilus. It grows to about 8 inches across, or 20 cm. Its close relative Allonautilus perforates is even rarer. In fact, it’s never been seen alive, and researchers don’t know much about it since all they have to study are empty shells found drifting in the water. It grows to about 7 inches across, or 18 cm.

Most living nautiloids are about that size, but the biggest is a subspecies of the chambered nautilus, often called the emperor nautilus. Before you get too excited, though, the biggest ones only grow to about ten inches across, or 25 cm.

Nautiloids don’t like water that’s too warm so they usually live near the bottom of the ocean, although their shells can’t withstand the pressures of abyssal depths. If a nautilus descends too far, its shell implodes and it dies instantly, like a hapless diver in a malfunctioning bathysphere. Nautiloids live in the Indo-Pacific Ocean and like the deeper parts of coral reefs.

So why did ammonites die out during the Cretaceous-Paleogene extinction event while nautiloids didn’t? Researchers think ammonites laid eggs that floated near the top of the ocean, while nautiloids lay eggs that stay on the bottom of the ocean. Specifically, female nautiloids attach their eggs to rocks in warm water, which take up to a year to hatch. Eggs at the bottom of the ocean were protected from most of the effects of the meteor impact, while those near the surface were killed.

Is it possible that some ammonites survived and still live in the deep sea, unknown to humans? I’m going to say probably not. Ammonites shared a lot of physical similarities with nautiloids, so they probably weren’t able to live in the deep sea without imploding. While it would be amazing if scientists discovered a living ammonite, we should celebrate that the humble nautilus is definitely still alive. It’s still blowing my mind, to be honest.

If you’d like to help nautilus conservation efforts, you can visit save the nautilus.com for more information. I’ll put a link in the show notes.

You can find Strange Animals Podcast online at strangeanimalspodcast.com. We’re on Twitter at strangebeasties and have a facebook page at facebook.com/strangeanimalspodcast. If you have questions, comments, or suggestions for future episodes, email us at strangeanimalspodcast@gmail.com. If you like the podcast and want to help us out, leave us a rating and review on Apple Podcasts or whatever platform you listen on. We also have a Patreon if you’d like to support us that way.

Thanks for listening!

Episode 085: Crocs, Gators, and Their Massive Terrifying Cousins

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This week’s episode is all about crocodiles, alligators, and their relations. Thanks to Damian, John Paul, and John Paul’s son for the recommendation!

A Chinese alligator:

It’s easy to tell alligators and crocodiles apart. Just ask them to stand side by side, then lean over and look down to see the head shape. Broad-headed alligator on left, slender-headed crocodile on right:

Saltwater crocodile. Look, I’m only going to say this once: DO NOT SIT ON A CROCODILE OKAY THAT IS JUST DUMB AND YOU WILL GET EATEN ONE DAY IF YOU KEEP ON DOING IT

A gavial:

Black caiman:

Further reading:

A newly discovered difference between alligators and crocodiles

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

This week’s episode is about crocodiles and alligators, and their relations. Thanks to a couple of different listeners for the suggestion, Damian and John Paul, and John Paul’s son. We’ve touched on crocodiles before in a couple of different episodes, including episode 53 about dragons, but alligators have barely had a mention.

Crocs and gators aren’t actually that closely related, but both are members of the order Crocodilia. This order also includes caimans and gavials, as well as some verrry interesting extinct members.

Crocodilians are amphibious reptiles. They spend much of their time in the water but also spend time on land. They breathe air, lay eggs, and depend on air or water temperature to regulate their body temperature. All crocodilians have evolved to take advantage of their watery habitat: long tails that are flattened laterally, eyes and nostrils close to the top of the head, short legs with webbed toes, and a flap at the back of the mouth that keeps water from flowing into the throat and airways. They can stay underwater for at least 15 minutes without needing to surface for air, and some individuals can stay underwater for close to two hours under the right conditions.

Crocodilians have thick protective scales on much of the body, called scutes, strengthened by osteoderms, or bony plates. Some scutes contain sensory receptors that sense touch, heat and cold, chemical stimuli, and especially the movement of water. Crocodilians see well even in darkness and have good hearing and smell too.

Some mother crocodilians lay her eggs in holes in the sand, but most build a nest out of vegetation. As the vegetation rots, it generates heat that warms the eggs. If the temperature in the nest is constantly above 90 degrees Fahrenheit, or 32 Celsius, more babies develop into males. If the temperature is cooler than that overall, more babies develop into females.

The mother protects the nest, which is usually near her den. Sometimes several females nest close to each other to help each other protect the nests. When her babies start hatching, the mother crocodilian digs them out of the nest since they aren’t strong enough to do it themselves, and carries the babies to water where they are safer. She also protects them for a while after they hatch. This is important, because baby crocodilians are vulnerable to predators—including adults of their own species.

Different species of crocodilians communicate in different ways. Some roar or bellow, some hiss, grunt, slap the jaws shut loudly, splash the head or tail in the water, or blow bubbles. Males often growl infrasonically—a sound humans feel more than hear, and which can cause the water around the male to shiver. That’s creepy. Baby crocodilians still in the egg will mimic tapping sounds, and yelp or grunt to let their mother know when they’re hatching.

One interesting thing about crocodilians is the way they walk. Most of the time a crocodilian walks with its belly touching the ground and its tail dragging. This is called the low walk. But unlike most other reptiles, most crocodilian species have ankle joints that allow it to raise its body up off the ground and walk like a mammal, with only the end of the tail dragging. This is called the high walk. Some smaller species can even run, a bounding gait something like a rabbit’s. Crocodilians can also jump.

If you’ve ever heard the phrase “crocodile tears,” which refers to someone who pretends to feel bad while doing something mean, it comes from the belief that crocodiles wept while eating their prey. The belief goes back at least 900 years and probably longer, and it’s actually based on a real phenomenon. When a crocodilian is in the water, its eyes are protected by both a see-through third eyelid, properly called a nictitating membrane, and by a tear-like lubricant that washes any grit out of the eye. The lubricant is visible when the animal is out of the water, and it looks like the crocodile is crying.

Many crocodilians are ambush hunters. They lie mostly submerged, only their eyes and nostrils above the surface of the water, and wait for an animal to approach. Then they grab the animal with their powerful jaws and drag it into the water to drown. This requires massive bite strength, and crocodilians have the strongest bite of any animal alive. Recently, 3D modeling of an alligator’s head revealed a second jaw joint that stabilizes the jaw and helps distribute the bite force throughout the skull.

In case you were wondering how to tell a crocodile from an alligator, crocodile snouts are more slender than alligator snouts. It’s easy to tell the two apart when their mouths are closed, since only the upper teeth are visible when an alligator closes its mouth, while a crocodile shows both upper and lower teeth.

Besides, there are only two species of alligator alive today, the American alligator that lives in the southern United States, and the Chinese alligator, which lives in eastern China. The Chinese alligator is the smaller species, no more than 7 feet long, or 2.1 meters. While most crocodilians have soft bellies, the Chinese alligator has an armored belly. It lives in marshes, lakes, and rivers but these days it’s critically endangered and mostly restricted to the Anhui Chinese Alligator Nature Reserve. In 1999, conservationists estimated that there were only about 150 Chinese gators alive in the wild. Fortunately, since then more protected habitats have been developed for the gators and captive breeding programs have released many young gators into the wild. Their numbers in the wild are increasing slowly, but since the gators also do well in captivity, it’s estimated that as many as 10,000 individuals live in zoos around the world.

As for the American alligator, back in 1967 it was listed as endangered, mostly due to hunting and the sale of baby alligators as pets. Alligators do not make good pets, which you could probably figure out just by thinking about how big gators get. That would be more than 15 feet long for a big male, or 4.6 meters. Fortunately, conservation made a huge difference to the American alligator and it’s now considered fully recovered from its low point in the 1960s.

The American alligator lives in wetlands throughout the deep southern states, including parts of Texas, across to Florida and up through parts of North Carolina. It eats pretty much anything it can catch, including fish, crabs and other crustaceans, birds, mammals, frogs and other amphibians, and reptiles like turtles and snakes. It also sometimes eats fruit. Because the alligator can tolerate a certain amount of salt water, and frequently lives near the ocean, occasionally one will eat a shark. But sharks sometimes eat alligators too. Alligators also help control the spread of exotic species released in the Florida Everglades and other areas, including Burmese pythons. Full-grown alligators frequently hunt on land, but young alligators mostly stay in the water. Young American alligators have thin yellowish stripes that fade as the gator grows.

There’s another crocodilian with a range that overlaps with that of the American alligator, the American crocodile. It’s usually paler in color than the alligator with a relatively narrow snout. It mostly lives in central America, but some do live in southern Florida, which makes southern Florida the only place in the world where gators and crocs live side by side in the wild. But crocodiles can’t tolerate cool weather as well as alligators, so cold snaps in Florida can kill off crocodiles while not harming alligators. Occasionally a big alligator will eat a smaller crocodile, but on average the croc is the bigger animal. Big males can occasionally grow over 20 feet long, or 6.1 meters. It frequently lives in salt water where it mostly eats fish and birds, along with small mammals, reptiles, amphibians, and crustaceans. It especially likes to eat lemon sharks. I mean, who wouldn’t, right? They sound delicious. Or maybe I just like lemons.

Unlike the American alligator, the American crocodile is endangered due to habitat loss, poaching, and pollution. It’s more dangerous to humans than the alligator, but not nearly as dangerous as some other species of crocodile.

The saltwater crocodile and the Nile crocodile are the most dangerous species to humans. The Nile crocodile can grow over 21 feet long, or almost 6.5 meters, and lives throughout much of Africa. The saltwater crocodile is the biggest crocodilian alive, and can grow up to 23 feet long, or 7 meters.

Like the American crocodile, the saltwater crocodile can tolerate salt water and frequently lives in coastal areas like the mouths of rivers, lagoons, and mangrove swamps. It’s found in parts of India down to northern Australia, and occasionally one will swim across the ocean to areas far from its usual range, including Japan and Fiji. Saltwater crocodiles, especially males, are territorial, and researchers think that about half of attacks on humans result from the human straying into a croc’s territory. These attacks aren’t usually fatal, but I bet they’re scary.

There are other crocodilians besides just the alligator and the crocodile. The gavial, also called the gharial or fish-eating crocodile, has a long, narrow snout that helps it catch the fish it eats. It lives in parts of India these days, in a few rivers and along the coasts, since it can tolerate salt water. It used to live throughout India and other parts of Asia, but it’s been hunted almost to extinction. In 1976 conservationists estimated that there were fewer than 200 gavials alive in the wild. Even after India put protections in place for the gavial, it continued to decline. In 2006 there were only 182 adult gavials alive. Conservationists are working hard to increase the population, including breeding them in captivity and releasing the babies into protected wildlife preserves in the wild. The main problems these days are loss of habitat and pollution, everything from dams across the rivers where it lives, heavy metal poisoning from polluted water, and drowning after entanglement in fishing nets. But population numbers have grown thanks to the conservation efforts, although there are probably fewer than 1,000 in the wild today.

The gavial can grow as long as the saltwater crocodile, although it’s usually much less heavy, with the longest measured at 23 feet long, or 7 meters. Adult males have a bulb at the end of their snouts that researchers think help them blow bubbles and make hissing and buzzing sounds that attract females.

Baby gavials eat tadpoles, frogs, and small fish. Adults eat fish and crustaceans. The gavial’s jaws are too delicate for it to feed on larger prey. In the past, hunters found jewelry in gavial stomachs and assumed they were maneaters, but it’s more likely they just swallowed jewelry lost in the river because it was shiny like fish scales.

There’s also a false gharial, which looks superficially like a gavial but has a broader snout. It’s reddish-brown with black splotches and some striping on the back and tail. These days it only lives in swamps in Indonesia and some nearby areas, although it used to have a broader range and also lived in rivers and lakes. Like the gavial, it’s been hunted to extinction in much of its former range for its skin and meat, and because people are afraid of it. It’s also vulnerable to habitat loss, including water pollution and draining of wetlands. It eats fish and other water animals, but it also preys on birds and mammals, and can grow more than 13 feet long, or 4 meters.

Caimans are most closely related to alligators and live in Central and South America. Some species are relatively small, from the 5 foot long, or 1.5 meter, Cuvier’s dwarf caiman, to the black caiman that can grow over 16 feet long, or 5 meters. Some researchers think the black caiman may occasionally grow up to 20 feet long, or 6 meters. Caiman scales are stiffened by calcium deposits, which makes caiman hide less valuable to leatherworkers than other crocodilian hides because it’s less pliable.

All crocodilians share an ancestor that lived around 240 million years ago. That same ancestor was also the ancestor of the dinosaurs. So it’s no surprise that crocodilians are considered the closest living bird relatives.

Paleontologists have discovered many extinct crocodilians, some of which look really strange. Mourasuchus, for instance, was a type of caiman that lived in South America during the Miocene, around 13 million years ago. Mourasuchus had long, flat jaws that looked something like a duck’s bill full of tiny conical teeth. Researchers think it may have been a filter feeder, filtering small animals from the mud at lake bottoms. But it was enormously big, some 39 feet long, or 12 meters.

Another possible filter feeding crocodilian was Stomatosuchus, which lived in Northern Africa around 95 million years ago and grew to 33 feet long, or 10 meters. It had a long, flat snout with small conical teeth in the upper jaw and may have had no teeth in the lower jaw. Some researchers think it might have had a pouched lower jaw like a pelican, which it used to catch small fish. It would suck in water, filling its pouch, then close its jaws and push the water out through its teeth. Any fish or other animals left in its mouth when all the water was expelled, it swallowed. But we don’t know for sure because only one Stomatosuchus skull has ever been found, and it was destroyed in 1944 when the museum it was in was bombed during World War II.

Purussaurus was another extinct caiman that lived in South America around 5 to 20 million years ago, and is estimated to grow as much as 41 feet long, or 12.5 meters. We don’t know its length for sure since we don’t have a complete skeleton, but if estimates are right, it was one of the biggest crocodilians that ever lived. It had a strong skull and huge teeth that allowed it to hold onto large prey.

Sarcosuchus was about the same size as Purussaurus, around 40 feet long, or 12 meters, but lived about 112 million years ago in what is now Africa and South America. It ate dinosaurs.

The largest living crocodilian ever reliably measured was a captive saltwater crocodile from the Philippines. He was captured in 2011 after rumors started that he had killed at least two people. He was kept on display in a wildlife center, and caretakers named him Lolong after one of the men who helped capture him. Lolong the crocodile was measured at 20 feet 3 inches long, or 6.17 meters, and he weighed 2,370 lbs, or 1,075 kg.

But crocodilians even larger than Lolong have been measured, just not by wildlife experts. Another saltwater crocodile in India has been estimated at 23 feet, or 7 meters, and a saltwater croc skull from Cambodia suggests that the living animal might also have been 23 feet long. A crocodile killed in Queensland, Australia in 1958 was supposedly 28 feet 4 inches long, or 8.64 meters, but this is probably an exaggeration.

But size is relative. A crocodilian that lived in South America some 60 million years ago and grew to a respectable 18 feet long, or 5.5 meters, probably got eaten by the largest known snake that ever lived, titanoboa. Titanoboa grew up to 42 feet long, or 12.8 meters. But that is a story for another day.

You can find Strange Animals Podcast online at strangeanimalspodcast.com. We’re on Twitter at strangebeasties and have a facebook page at facebook.com/strangeanimalspodcast. If you have questions, comments, or suggestions for future episodes, email us at strangeanimalspodcast@gmail.com. If you like the podcast and want to help us out, leave us a rating and review on Apple Podcasts or whatever platform you listen on. We also have a Patreon if you’d like to support us that way.

Thanks for listening!

Episode 084: Gorillas

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This week let’s learn about a close relative, the gorilla!

But first, if you don’t already listen to these fantastic animal podcasts, definitely check them out!

Species   All Creatures   Life Death & Taxonomy   Animals to the Max   Varmints   Cool Facts about Animals

Why hello there:

This gorilla has some lettuce. It looks pretty good:

Some mountain gorillas with awesome hair:

GORILLA BABY FLOOFY HEAD ALERT:

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

This week we’re going to learn about gorillas, mostly because I just found out they sometimes hum happily while they eat. And yes, I have audio of happy munching gorillas that will make you want to snack too.

But first, did you notice what happened last week? If you subscribe to several animal podcasts, you might have noticed that the first week of September 2018 suddenly turned into big cat week! A bunch of us animal podcasters thought it would be hilarious to release episodes covering the same topic in the same week.

Species covered snow leopards, All Creatures covered lions, Life Death & Taxonomy covered jaguars, Animals to the Max covered wildcats, Varmints covered tigers, Cool Facts about Animals covered mountain lions, and of course we had our mystery big cats episode. I’ll put links in the show notes to each podcast, but I recommend all of them. One thing I love is that all these podcasts can cover the same topic but approach it so differently that you’ll never get bored and think, Oh, I already know about this animal.

Anyway, let’s learn about gorillas!

The gorilla is a great ape, closely related to chimpanzees, bonobos, humans, orangutans, and gibbons. There are two species, the eastern and the western, separated by the Congo River, and several subspecies. All gorillas live in Africa, but different species and subspecies live in different environments. Eastern gorillas prefer forests, including bamboo forests, but the mountain gorilla subspecies lives at a much higher elevation. Western gorillas live in swampy forests too. The western gorilla’s scientific name is Gorilla gorilla, and the scientific name of the western lowland gorilla subspecies is Gorilla gorilla gorilla. Don’t say you never learned anything from a podcast.

The gorilla is the largest primate alive today. They usually knuckle-walk, but can walk upright for short distances when they want to, usually when carrying something. Gorillas are vegetarian, although they will also eat insects. They have brown eyes and unique fingerprints like humans have. They also have black, brown, or grayish hair, and the western lowland gorilla also has a reddish forehead. Mountain gorillas have longer hair than lowland gorillas. They look awesome. Male gorillas develop silver hair on the back as they mature, which is why they’re usually called silverbacks. A silverback male acts as the leader of his group, making decisions and stopping other gorillas from arguing with each other. The silverback also plays with the children in his troop, even if they aren’t his offspring. If the group is attacked, the silverback will defend his troop to the death—in addition to his silver fur, silverbacks develop large canine teeth that can inflict massive wounds. But the gorilla is so big and strong, it doesn’t have many predators. Leopards will occasionally kill a gorilla if they catch one alone, but generally the only danger to gorillas comes from humans.

The gorilla is vulnerable to habitat loss, poaching, and human disease. More than 5,000 gorillas may have died due to the ebola virus outbreak in the 2000s, and gorillas can also suffer from malaria. But things are looking up for the gorilla, at least a little bit. The population of critically endangered mountain gorillas in the Virunga Volcanoes has doubled in only 25 years, finally climbing over 1,000 individuals, following some intensive conservation efforts.

In the 1990s, researchers estimated that there were only 50,000 western lowland gorillas alive. Then a survey of gorilla populations in the Republic of the Congo made an amazing discovery. In 2007, researchers discovered that there was an entire population of gorillas in the swamps and forests that they had never even known about—and not just a few gorillas, either. Estimates put the population at about 125,000. That doesn’t mean there’s nothing to worry about, of course. Gorillas are still endangered, but at least there are more of the western lowland gorilla than we thought.

The gorilla spends most of its time on the ground. Young gorillas will climb trees, but adults are usually too big and heavy and feel more comfortable on the ground unless they’re actually after a specific food. Just like humans—and in fact, a recent study found that the heel bones of our ancestor Australopithecus had more similarities with gorilla heel bones than with chimpanzee heel bones, even though humans and our ancestors are more closely related to chimps. The study gives researchers a better idea of how our ancestors got around.

At night, each gorilla builds a nest to sleep in from branches and leaves. These are on the ground, and since gorilla troops travel sometimes several miles every day to find food, they usually build a new nest every night. Sometimes they’ll build a nest to nap in during the day too. Babies nest with their mothers, but when a young gorilla is around three years old, it will start building its own nest near hers.

As young gorillas grow up, they usually move away from their home troop and join other troops, or in the case of males, they eventually start their own troops. The female chooses her mate, and usually has one baby every four years or so. Baby gorillas are even smaller than human babies, only about four pounds, or 1.8 kilograms. Babies cling to the mother’s fur and ride on her back when she’s walking.

Gorillas eat lots of different types of plant, especially fruit, tree bark, various roots and leaves, and the stems of some plants. An adult gorilla eats around 40 pounds of food a day, or 18 kg. And gorillas frequently sing and hum while eating, especially when a gorilla is eating a food it particularly enjoys. Researchers think that the singing is partly communication with others—sort of a dinner-time conversation—partly just to show their happiness with having food they like. This is what gorillas sound like while eating and humming. I don’t know about you, but this sounds totally appetizing. It sounds like they’re eating popcorn, but in fact it’s the leaves of the banana tree.

[gorillas eating and humming]

Like all great apes, gorillas are highly intelligent. They use tools, laugh, grieve their dead, have a complex system of communication, and even prepare food in ways that varies from region to region. A few captive gorillas have been taught to speak using a form of sign language, most famously Koko.

Koko was an amazing ape. She only died earlier this year, 2018, at the age of 46. She was a western lowland gorilla born in the San Francisco Zoo, and her proper name was Hanabiko, which means ‘fireworks child’ because she was born on the Fourth of July. She spent much of her life in a gorilla preserve in Woodside, California, and was purposefully exposed to spoken English from about age one. By the time she died, she could understand more than 2,000 words in English and knew over 1,000 signs.

Different studies of Koko and her use of language come to different conclusions. Some researchers claim she didn’t demonstrate any kind of grammar, while others claim her language use was extremely human. But everyone except utter curmudgeons agrees that Koko was actually using language to communicate. She even made up some signs when she needed a new word.

Koko also demonstrated a sense of humor, encouraged other gorillas when they attempted to sign, talked about her memories, recognized herself as the individual in a mirror, and even gave her pet kitten a name without being prompted. His name was All Ball, and when he later escaped her enclosure and was killed by a car, she cried. She had other pet cats later, all named by her, including Lipstick, Smoky, Miss Black, and Miss Grey. I’m just saying, Lipstick is a great name for a cat. Koko was reportedly gentle with her pets and when they were kittens, she treated them like baby gorillas.

Young gorillas play games like all young mammals do. Tag, for instance. Young gorillas, and sometimes even older ones, play tag. Researchers say that according to their observations, it appears that the rules of gorilla tag are pretty much the same as the human version of tag. Researchers do not report whether or not there was a big argument about who hit whom when they supposedly called a time-out to tie their shoe, probably because gorillas don’t wear shoes.

You can find Strange Animals Podcast online at strangeanimalspodcast.com. We’re on Twitter at strangebeasties and have a facebook page at facebook.com/strangeanimalspodcast. If you have questions, comments, or suggestions for future episodes, email us at strangeanimalspodcast@gmail.com. If you like the podcast and want to help us out, leave us a rating and review on Apple Podcasts or whatever platform you listen on. We also have a Patreon if you’d like to support us that way.

Thanks for listening!

Episode 082: Animals with Face Tentacles

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This week we’re going to learn about animals with TENTACLES ON THEIR FACES oh my gosh

Thanks to Llewelly for the topic suggestion!

Don’t forget to come see me on the panel How to Start Your Own Indie Podcast at DragonCon 2018, at 4pm on Sunday, September 2, 2018 in the Hilton Galleria 6.

A tentacled snake:

A star-nosed mole. Hello, nose star!

A caecilian, with its tiny tentacle circled:

A squidworm:

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

I’m back from Paris this week and definitely jet-lagged, but this episode should wake everyone up. It’s about animals with TENTACLES ON THEIR FACES

A big thanks to Llewelly who sent me an article about the tentacled snake, which turned into this episode. I love it when people send me links to articles or suggestions for topics. I have a bunch of suggestions I haven’t gotten to yet, but I promise I will as soon as possible. I’m like a dog in a park full of squirrels. There are so many exciting animals to chase, it’s hard to know which one to follow.

That reminds me. If you go to the strangeanimalspodcast.com website, there’s a page with a list of animals that I’ve covered in various episodes. If you don’t see your favorite animal on that list, feel free to email me with your suggestion!

Also, if you’re listening to this episode the week it comes out, this coming weekend I’ll be at DragonCon in Atlanta. If you’re going to be there too, I’m on a panel about how to start your own podcast, part of the podcasting track. It’ll be at 4pm on Sunday in the Hilton Galleria 6.

Now, on to the tentacles.

We’ll start with the tentacled snake, which lives in parts of southeast Asia. It lives in both fresh and ocean water and doesn’t come on land very often. When it does, it has trouble getting around since it’s adapted for swimming. It grows up to three feet long, or about 90 cm, and is brown or gray, sometimes with stripes, sometimes with blotches. Its body and head are flattened and its scales are rough. Basically it looks a lot like an old stick with lichen on it. If something disturbs it, it holds its body completely rigid even if it’s lifted out of the water, which makes it look even more like a stick.

Its nose is squared-off with nostrils at the top so it can more easily grab breaths at the water’s surface. And it has a pair of short tentacles at the corners of its snout that it uses to help it sense the fish and frogs it eats. It has weak venom, but its fangs are in the back of its mouth and not dangerous to humans.

It likes slow-moving water, murky water, or water with a lot of vegetation in it because it doesn’t rely on its eyes to sense fish, although it has good eyesight. The tentacles are finely attuned to movement in the water and the snake can sense when a fish is approaching even if it can’t see the fish.

The tentacled snake is an ambush predator. It uses its tail to anchor itself in the water, and holds its body in a J shape, either head down or head up. When a fish swims nearby, the snake moves the looped section of its body extremely quickly without moving its head, which creates a pressure wave in the water that makes the fish think there’s a predator approaching. The fish doubles back and tries to flee, but in the wrong direction—basically right into the snake’s face.

Another animal with tentacles on its face is the star-nosed mole. It’s a mammal that lives in parts of northeastern North America, especially in marshy areas. Like other moles, it’s not very big, only about six inches long, or 15 cm. Its fur is dense and velvety, it has tiny eyes and ears that are mostly hidden under its fur, and its tail is short. It spends a lot of time in the water but it also digs shallow tunnels. It eats worms, insects, mollusks, and small animals of various kinds, including frogs.

The star-nosed mole has eyes, but they’re tiny and don’t function very well. Instead, it senses prey and navigates using the unique structure at the tip of its snout: 22 tiny tentacles containing over 25,000 sensory receptors. The structure is roughly star-shaped so is usually called a nose star. It actually is more starfish-shaped, if you ask me, like it has a tiny pink starfish growing out of the tip of its nose, with two little nostrils in the middle.

Mammals are not known for their tentacles. The star-nosed mole is the only mammal with tentacles, in fact—at least as far as I can find out. And the star-nosed mole has tons of weird adaptations as a result. The tentacles of its nose star are the most sensitive organ of touch in any mammal. Think about how sensitive your fingertips are and how much information you can learn from just touching something with a fingertip. The star-nosed mole’s star has five times the number of nerve fibers than your entire hand contains, and the star is smaller than your pinky fingernail. It’s so sensitive and the mole can gain so much information from it that researchers compare it more to a sense of sight than of touch. The mole’s nervous system is also extremely efficient in order to process all the information coming from the star, literally just about at the physiological limit of neurons. That means the star-nosed mole can identify prey and decide whether to eat it in only 8 milliseconds.

You know how long it takes you to blink your eyes? About 350 milliseconds. A star-nosed mole could have examined and made eating decisions about 44 things in that same time. And since it can also eat most small prey like bugs in only 200 milliseconds, it could have also eaten one and a half things in the time you blink your eyes. This is blowing my mind, everyone, especially since I am the slowest eater in the world.

You know what else the star-nosed mole can do? It can smell underwater. It blows tiny bubbles into the water and breathes them back in to examine them for scents. The tentacles of the mole’s star keep the bubbles from floating away before the mole can breathe them back in. The star-nosed mole is a good swimmer and the tunnels it digs often start and end underwater. Researchers think that hunting underwater and in swampy soil helps keep the mole’s sensitive nose star from damage. If you rub your fingertips lightly over sandpaper or a brick’s surface, after only a few seconds you’ll feel some discomfort, but soft mud doesn’t hurt fingertips or nose stars.

Another animal with face tentacles is the caecilian. Caecilians are legless amphibians that look like worms or snakes, but are more closely related to frogs and salamanders. Probably. We don’t know a lot about how caecilians developed, and some researchers think they may actually be more closely related to reptiles than amphibians.

The longest caecilian, Thompson’s caecilian, grows to some five feet long, or 1.5 meters. It lives in Colombia in South America and is gray or black. The smallest species only grow to about four inches long, or 10 cm. There are some 180 species of caecilian that we know of, which live in tropical regions in many parts of the world. Many dig burrows and spend most of their time underground, while some live in the water. Most eat small animals like worms and insects. Even though all caecilians are long, unlike worms and snakes, most don’t actually have a tail, or may only have a short tail. It’s just hard to tell because they also don’t have legs. Some species appear snakey while some have what look like body segments like an earthworm, which helps it wriggle its way through soil like a worm. It even moves in what’s called an accordion-type fashion like a worm where it bunches up parts of its body and stretches other parts out to advance.

The caecilian has a pair of tiny tentacles between its eyes and nostrils that grow out of an opening in the snout. The tentacles appear to have developed from the tear duct and eye muscles. Some caecilian species have tiny eyes, although they may be hard to see. Some species have no eyes at all. Some species have eyes, but they’re actually beneath the skull bones. In two species from Africa, the eyes are under the skull but are connected to the tentacles, and the caecilian can extend its tentacles and actually move its eyes out of the skull and into the tentacle. The tentacle tips lack pigment so light can pass through. You see what’s going on here? EYE STALKS. Eye stalks aside, researchers think that the tentacles mostly contain chemical receptors that the caecilian uses to find prey.

Caecilians are really interesting animals. Different species are sometimes radically different from each other in very basic ways. For instance, how babies develop. Some caecilian species lay eggs that hatch into larvae, like tadpoles. Some lay eggs that hatch into miniature caecilians, like certain species of frog whose eggs hatch into tiny frogs instead of tadpoles. Three caecilian species give birth to up to four live babies that are already developed, and those babies grow within the mother by eating a special oviduct lining of her body, which they scrape off with teeth modified for this purpose. Two egg-laying species have a similar process for feeding babies, but in this case the mother caecilian develops a thickened skin that’s full of nutrients, which her babies scrape off with modified teeth. It doesn’t hurt the mother, who grows more of the skin as the babies eat it.

One species of caecilian doesn’t even have lungs, Atretochoana eiselti. Some salamanders don’t have lungs either, and instead absorb oxygen through the skin. But salamanders that breathe this way are either very small or live in cold, fast-flowing water with high oxygen content. Atretochoana grows nearly three feet long, or 80 cm, but seems to prefer warmer, slower water. So researchers aren’t sure how it breathes. Not a lot is known about it in general, but it does have muscles that attach to the skull that aren’t found in any other organism studied. Its head is broad and flat. We don’t even know what it eats.

The caecilian has two sets of jaw muscles, if you were wondering. Researchers aren’t sure why, but they suspect it has something to do with keeping the head and neck rigid while the caecilian pushes its way through the soil. Some caecilians are toxic, and since many species are brightly colored, it’s a good bet that those species probably contain at least some toxins. But again, we don’t know for sure because there haven’t been very many studies on caecilians.

There are other animals with tentacles on their faces, but those are the big three that are alive today. Catfish whiskers, properly called barbels, aren’t technically tentacles, and I have a whole episode on catfish planned eventually so I’ll skip them this time. Snails and slugs have four head appendages that are tentacle-like, two of them eyestalks and the other pair for smell and touch. Back in the Cambrian, the eel-like Pikaia gracilens had a pair of long tentacles on its head and rows of shorter bristles along the sides of its head that may have acted as gills. Some species of modern lancelet look very similar to Pikaia and even have similar sensory appendages, but these are more similar to cilia than actual tentacles.

But another living animal, a deep-sea polychaete worm called the squidworm, has actual tentacles on its head—ten of them. It grows around 4 inches long, or 10 cm, not counting its tentacles, which are as long or longer than the body. It lives in the depths up to 2800 meters down, or almost 1.75 miles below the ocean’s surface. Two of its tentacles are yellowish and usually held in a curled-up position, and those are the ones the worm uses to collect food—probably plankton and detritus that sinks from the upper ocean. The other tentacles are used for breathing, and it also has feathery sensory organs growing from its head.

But the awesome thing is, the squidworm was only discovered in 2007 off the coast of the Philippines. And it’s not rare. In fact, it seems to be really common, which means there are probably other species of squidworm that haven’t been discovered yet. And there might be other tentacled things down there too, who knows?

You can find Strange Animals Podcast online at strangeanimalspodcast.com. We’re on Twitter at strangebeasties and have a facebook page at facebook.com/strangeanimalspodcast. If you have questions, comments, or suggestions for future episodes, email us at strangeanimalspodcast@gmail.com. If you like the podcast and want to help us out, leave us a rating and review on Apple Podcasts or whatever platform you listen on. We also have a Patreon if you’d like to support us that way.

Thanks for listening!

Episode 081: Little Yard Animals

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This week we’re staying at home and looking around our own yards and gardens to learn about some of the little critters we see every day but maybe never pay attention to. Thanks to Richard E. for the topic suggestion, and thanks also to John V. and Richard J. for other animal suggestions I used in the episode!

The common or garden snail:

A couple of robins:

A brown-eared bulbul nomming petals:

An Eastern hognose snake. srsly, no one believes ur dead snek:

The hognose in happier times:

An Australian water dragon. Stripey!!

The edible dormouse. I think you mean the ADORABLE dormouse:

The eastern chipmunk:

A guppy with normal eyes:

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

I’m out of the country this week, visiting Paris, France and undoubtedly eating my weight in pastries and cheese as you listen to this. Since I’m away from home, though, I’m probably feeling a little homesick. So this week’s episode is all about the ordinary-seeming little animals found in gardens and yards, a suggestion from Richard E. This is also a perfect opportunity to feature some listener-suggested animals that aren’t really complex enough for a full episode but are still really interesting.

But I’m not going to just look at the animals in my yard. Depending on where you live, hopefully I’ll touch on one or two animals you might be able to see for yourself just by going outside and looking around.

It sounds corny, but no matter how boring you think the nearest patch of greenery is, if you look closely enough you’ll see a world of activity. The other day I was sitting on a bench outside the library, enjoying a breeze and the shade of an oak tree, and because I am sort of disgusting and was wearing flip-flops, I was picking at one of my toenails that was partly broken. I pulled the broken part off and flipped it into the grass nearby. A few minutes later I noticed that a couple of ants had found that piece of toenail and were working hard to wrestle it over the grass and twigs and presumably back to their home. Why? Why did they want my toenail? It’s just a piece of keratin, and while keratin is a type of protein, it’s not digestible by most animals.

I looked it up, and guess what. I am not the first person to notice this. No one’s sure why ants take toenail and fingernail clippings, either. They’re not interested in hair, just nails. Hair and nails have different properties so it’s possible the ants are able to digest the keratin in nails but not the keratin in hair.

That was probably not the best story to start with. Try to forget that picture of me and remember that I’m sipping wine at a sidewalk café in Paris right now, or touring the Louvre.

Let’s move on to a small invertebrate that is sometimes eaten as a delicacy in France and other parts of Europe, the common or garden snail. That’s Cornu aspersum, which is native to the Mediterranean and western Europe, but which has been introduced in other parts of the world. It’s pretty big for a snail, with a shell almost 2 inches across, or 5 cm. The shell varies in color and pattern, but it’s usually brown with yellow markings.

The shells almost always coil to the right, or clockwise, but the occasional rare snail will have a left-coiling shell. Researchers have found that left-coiling shells are due to a genetic mutation and only occur about once in a million snails. A famous lefty snail was called Jeremy, who died in October 2017 at the ripe old age of two years. Since snails are hermaphrodites who both fertilize other snails’ eggs and lay their own, a boy name seems like a random choice. Jeremy was discovered by a retired scientist in his London garden, who gave the snail to the University of Nottingham for study. After a public appeal, two other left-handed snails were found by the public, but while the three snails all laid eggs, all the babies had clockwise shells.

The garden snail mostly eats plants, but will sometimes scavenge on small dead animals like drowned worms and squished slugs. When it’s threatened, it can pull itself all the way into its shell, and if it’s too dry out, it will pull itself into its shell and secrete a thin layer of mucus, which dries out to form a seal.

Snails raised to be eaten are kept in special cages, traditionally made from wine-grape vines. I am probably not going to eat any snails while I’m in France, but you never know. I will let you know if I do.

One animal Richard E. suggested as a topic is the robin, specifically the difference between the American robin and European robin. That’s a good one for this episode, because in both North America and Britain, the robin is a really common bird—so common that most people barely pay any attention to it.

The American robin is a type of thrush. It lives year-round in most of the United States and part of Mexico, spends summers in much of Canada, and winters in parts of Mexico. It’s big for a songbird, around 10 inches long, or 25 cm. It’s dark gray on its back, with a rusty red breast, white undertail coverts, and a long yellow bill. It also has white markings around its eyes. Young birds are speckled. It mostly eats insects, worms, and berries. If you see a bird on the ground, running quickly and then stopping, it’s probably a robin. Mostly the robin hunts bugs by sight, but it has good hearing and can actually hear worms moving around underground. You can sometimes see a robin with its head cocked, listening for a worm, before pouncing and pulling it out of the ground, just like in a cartoon.

American robin eggs are a light teal blue, so common and well-known that robin’s-egg-blue is a typical description of that particular color. In the spring after eggs hatch, the mother robin will carry the eggshells away from the nest to drop them, so predators won’t see the shells and know there’s a nest nearby. That’s why you’ll sometimes see half a robin eggshell on the sidewalk. It doesn’t mean something bad happened to the baby, just that the mother bird is doing her job. Both parents feed the chicks, and the parents also carry off the babies’ droppings to scatter them away from the nest.

This is what an American robin’s song sounds like. If you live in North America, you’ve probably heard this song a million times without noticing it.

[robin song]

The American robin was named after the European robin, also called the robin redbreast, but while the European robin does have a rusty red breast, it doesn’t look much like the American robin. The European robin is much smaller, only around 5 inches long, or 13 cm, with a brown back, streaked gray or buff belly, and orange face and breast. It has a short black bill and round black eyes. It eats insects, worms, berries, and seeds. The eggs are pale brown with reddish speckles.

It lives throughout much of Eurasia, but robins in Britain tend to be fairly tame, probably because they were traditionally considered beneficial in Britain and Ireland, so farmers and gardeners wouldn’t hurt them. In other parts of Europe they were hunted and are much more shy. European robins are also common on Christmas cards in Britain and Ireland, possibly because in the olden days, postmen used to wear red jackets. They started to be called robins as a result, and since postmen bring Christmas cards, the bird robin became linked with card delivery and finally just ended up on Christmas cards. Plus, their orange markings are cheerful in winter. And, of course, in the traditional story Babes in the Wood, which is often associated with Christmas pantomimes, robins cover the children’s dead bodies with leaves. Because nothing says Christmas spirit like a story about dead children.

This is what the European robin sounds like. If you live in Britain or parts of Europe, you’ve probably heard this song a million times without noticing it.

[other robin song]

Another common bird in gardens, this one from Japan and other parts of Asia, is the brown-eared bulbul. It’s about the size of the American robin, around 11 inches long, or 28 cm, including its long tail. It’s gray or gray-brown all over, with a speckled breast and belly, a sharp black bill, and a dark brown spot on the sides of its head that gives it its name. It mostly eats plants, including fruit, seeds, flowers, and even leaves. I have a picture in the show notes of one chowing down on a flower, just swallowing petals like it’s in a video game and petals give it a power-up. It likes nectar too, and in spring and summer especially will look like it has a yellow head or yellow markings because of all the pollen on its feathers. It helps pollinate plants as a result. It also sometimes eats insects. It gathers in large flocks at times and many farmers consider it a pest, especially fruit farmers.

It has a loud song and call that many people dislike. I’ll let you decide, if you’re not already familiar with it. I kind of like it, to be honest. This is what a brown-eared bulbul sounds like:

[brown-eared bulbul call]

Listener John V. recently suggested the Eastern Hognose snake for an episode, and tickled me because he referred to it as the “dramatic hognose snake.” The hognose is a common snake in many parts of North America, and can grow almost four feet long, or 116 cm, although about half that length is much more average. Its snout turns up like a little snub nose. It varies in color and pattern, and some snakes are black or gray, some orange, brown, even greenish. Some snakes have no pattern, some snakes have various colored blotches or even a checkered pattern. The belly is usually yellowish but is sometimes gray or almost white. It has a big head that makes some people believe it’s venomous, but it’s actually harmless to humans and most animals.

The only animals that really need to worry about the Eastern hognose are amphibians, like toads and frogs. As it happens, the hognose does have mild venom, but it’s only effective on amphibians. It especially likes to eat toads, and while some toads are toxic, the hognose snake is resistant to toad toxins. A toad will frequently puff itself up to make it appear larger and make it hard for a snake to eat, but the Eastern hognose has a solution for that too. It has big teeth at the rear of its upper jaws, like fangs in the back of its mouth. It uses those teeth to puncture puffed-up toads so they deflate.

But the most memorable thing about the Eastern hognose, and the thing that earns it the drama snake award, is what it does when it feels threatened. Phase one of the dramatics is aggression. The snake will flatten its neck to look more threatening, raise its head like a cobra, and hiss and strike—but without biting. It’s just trying to scare you away. If that doesn’t work, the snake puts phase two into effect. It will flop down and roll onto its back, its tongue hanging out, and emit a foul musky smell from its cloaca, and play dead. If you call its bluff and roll drama queen snake onto its belly, it will turn onto its back again. It is really insistent that it is dead.

A common reptile visitor to yards in Australia is the water dragon. Of course Australia would have a little dragon running around in suburban neighborhoods. Males can grow up to three feet long, or a little over a meter, with females smaller, but those lengths include a tail that’s almost twice the length of the body. Males are more brightly patterned than females. It’s a long-leggedy lizard with a spiky crest along its head and spine. It’s generally a pale greeny-grey with dark stripes, especially on the tail and legs, or gray with white stripes. Depending on the species and individual, it may also have a colorful blotch on the throat, usually white or yellow, but sometimes orange or red.

It’s a fast runner and can even run on its hind legs if it really needs to hurry. It climbs trees well, but it especially likes water and is semi-aquatic. Its long tail helps it swim. It likes to bask on branches overhanging the water, and if something threatens it, it drops into the water, where it hides. It can stay underwater without needing to take another breath for over half an hour. It eats small animals like frogs and worms, crustaceans and mollusks, insects, fruit, and plants.

In areas where it gets cold in winter, such as Sydney, the water dragon will dig a burrow if it doesn’t already have one, close the entrance off with dirt, and hibernate until spring, when it emerges and starts searching for a mate. Males sometimes fight each other, biting and scratching. Once the weather is warm, the female lays 6 to 18 eggs in a hole she digs in sandy soil.

Water dragons will visit yards if there’s cover and a water source nearby, whether it’s a creek or just a dog’s water bowl. Don’t try to pet one, though. Dragons bite.

Now let’s look at a couple of common rodents. The edible dormouse lives throughout much of western Europe and is big, about the size of a squirrel, which it also roughly resembles. It’s grey or grey-brown with paler underparts. In autumn when it’s preparing for hibernation it gets very fat, which is why it’s also called the fat dormouse. The name edible dormouse comes from the Romans, who used to farm them in captivity and eat them as a delicacy. In some parts of Europe, especially Slovenia, wild edible dormice are still trapped and eaten.

The edible dormouse lives in dense forests, caves, and people’s attics, where it can be a real pest. It eats plants, especially fruit and nuts, but will eat bark and leaves, and sometimes bird eggs and insects. It especially likes beech tree seeds. It’s mostly nocturnal. Unlike most rodents, it doesn’t always breed every year.

If a predator grabs the edible dormouse’s tail, the skin and fur will slide off, allowing the dormouse to escape. The exposed tail vertebrae later break off and the wound heals up, making the tail shorter. That is kind of horrifying.

Chipmunks are rodents common throughout North America, although the Siberian chipmunk lives in Asia. The Eastern chipmunk is the one I’m going to talk about today, primarily because I got audio of one calling this morning on my way to work. I spilled coffee all over myself to get the audio, so I definitely want to share it.

The chipmunk is larger than a mouse but smaller than a squirrel. It has reddish-brown fur with stripes down its sides, a white band in between two thinner black bands. It prefers woodlands with lots of brush and rocks to hide in, but it lives in parks, yards, and definitely all over the college campus where I work. It climbs trees well but mostly it stays on the ground. It digs complex burrows with tunnels that can be more than 11 feet long, or 3.5 meters. It even digs a special latrine burrow to keep droppings out of the rest of the burrow system, and will throw nut shells and other trash into the latrine too. When it’s digging a new tunnel or burrow, it carries the dirt it’s dug away from the tunnel entrance in its cheek pouches, so predators won’t notice newly dug soil and come to take a look.

The chipmunk is omnivorous, and eats everything from bird eggs, worms, snails, and insects to seeds, nuts, and mushrooms. It even eats small animals like baby mice and nestling birds. It carries food in its cheek pouches to store for the winter, and helps disperse some plants as a result. It doesn’t hibernate, but in winter it spends most of its time sleeping, which is pretty much what I like to do in winter too.

THIS is what an Eastern chipmunk sounds like! A cup of coffee died to bring you this audio:

[chipmunk sound]

Our final animal isn’t something you’d typically find in your yard or garden—but you might find it in your house, if you have a freshwater aquarium: the guppy. A different Richard suggested this animal, specifically my brother Richard. He texted me a while back about Poecilia reticulata, a “common aquarium fish that can turn its little eyes black.” Then we texted back and forth about how that would be a really neat superpower, and how we would apply it in our lives if we could turn our eyes black.

The guppy is a tropical fish native to parts of South America, although it’s been introduced into the wild in other parts of the world and is an invasive species in many places. In the wild it eats algae, insect larvae, and various tiny animals. It’s usually between one and two inches long, or 3 to 6 cm, with females being larger. Females are gray or silvery in color, while males are gray with spots of bright color. Aquarium enthusiasts breed different strains of guppy that may have bright colors and striking patterns.

So does the guppy turn its eyes black? Yes, it really does. Most of the time guppies have silver eyes, but some species can change their eye color in only seconds. In the wild, guppies that live in dangerous areas with many predators tend to group together and cooperate. But guppies that live in safer areas tend to be loners and more aggressive toward each other. When a guppy is angry at another guppy, it turns its eyes black to indicate that it’s willing to fight. Other guppies may back off at that point, or if the other guppy is bigger, it may attack. Researchers don’t know yet how guppies change their eye color.

Until next week, when I’m home from Paris and hopefully caught up on my sleep, remember to look around at the strange little animals in your own backyard. But watch out if their eyes turn black.

You can find Strange Animals Podcast online at strangeanimalspodcast.com. We’re on Twitter at strangebeasties and have a facebook page at facebook.com/strangeanimalspodcast. If you have questions, comments, or suggestions for future episodes, email us at strangeanimalspodcast@gmail.com. If you like the podcast and want to help us out, leave us a rating and review on Apple Podcasts or whatever platform you listen on. We also have a Patreon if you’d like to support us that way.

Thanks for listening!

Episode 080: Mystery Dogs

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This week we’re looking at some strange and mysterious canids from around the world!

The African wild dog:

A dhole:

An old photo of the ringdocus and a newer photo of the ringdocus:

A coyote:

Sri Lankan golden jackal:

The maned wolf MONEY SHOT:

A bush dog:

A stuffed Honshu wolf, dramatically lit:

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

This week let’s look at a bunch of mystery doggos from around the world! I really like dogs, but for some reason dogs and their relations don’t come up much on the podcast. When I started looking into mystery canids, though, I found so much information that there’s no way I can stuff even half of it into one episode. So we’ll definitely be revisiting mystery dogs in the future.

The family Canidae includes dogs, wolves, coyotes, jackals, and foxes. Yes, foxes are canids, but not closely related to more dog-like canids. We’re going to skip the foxes this week, since foxes deserve an episode all their own eventually.

Dogs were domesticated at least 9,500 years ago, possibly as long as 14,700 years ago, maybe even as long as 36,000 years ago. Dogs and humans go way back. The closest living relative of the dog is the gray wolf, which is still alive today, but the wild ancestor of the domestic dog was a different species of wolf that has gone extinct.

There are canids called wild dogs, but they’re not the same species as domestic dogs. The African wild dog, for instance, is not very closely related to dogs and wolves—in fact, it’s the only species in its own genus. It’s a tall, lean canid with large ears and no dewclaws. It has a yellowish coat with black blotches and some white spots, including a white tail tip, although some subspecies have darker coats. As the dog ages, it loses its fur until old dogs are nearly bald. It hunts in packs and mostly preys on antelopes, warthogs, ostriches, hares, and rodents.

The nomadic Tuareg people who live in northern parts of Africa around the Sahara have stories of a supernatural creature called the Adjule, among other names. The Adjule’s description makes it sound a lot like the African wild dog, including its lack of a dew claw. Since the African wild dog is rare in that part of Africa, it’s possible that rare sightings of what is a distinctively odd-looking animal may have given rise to the stories.

Another so-called wild dog is the dhole, also called the Indian wild dog, which is closely related to the African wild dog. It used to be common throughout Eurasia and North America, but these days it’s restricted to parts of Asia and is endangered. It looks something like a fox and something like a wolf, but is neither. Like many other canids in this episode, the dhole has its own genus. Because it tends to be easily tamed and is sometimes kept as a pet, researchers once believed domestic dogs might have descended from the dhole or an ancestral species of dhole, but genetic evidence shows that the dhole isn’t closely related to domestic dogs or to wolves.

There are three subspecies of dhole, two of them reddish-brown in color and one with fur that’s pale brown in winter. But there is a mystery animal called the gray dhole that may turn out to be a fourth subspecies or something else.

The gray dhole supposedly lives in the forests and mountains of Myanmar. It’s dark gray with a black muzzle and small, round ears, and is supposed to be smaller than the other dhole species. In 1913 a Major E.G. Phythian-Adams wrote about the grey dhole after he saw one that year, and in 1933 E.H. Peacock mentioned it in his book A Game Book for Bhurma and Adjoining Territories. In 1936 an explorer named Tsaing reported seeing one in Burma. But after these reports, the Bombay Natural History Society tried to find physical evidence of the animal in the 1950s, but couldn’t track down anything. They only found one person who even reported seeing the grey dhole. So even if it is a separate species or subspecies and not just a rare color morph of a known species of dhole, it’s probably extinct now.

Kipling wrote about the dhole in one of his Jungle Book stories, calling it the red whistling dog of the Deccan, and reporting that packs of the animals were so ferocious that even tigers would avoid them. This is true, even the whistling part. Instead of barking or howling, dhole calls are whistles. This is what a dhole sounds like:

[dhole sound]

In 1886 a Montana settler named Israel Hutchins shot a wolflike animal that had reportedly been killing livestock. No one knew what it was, so Hutchins traded it to a taxidermist for a cow. He needed the cow because when he first tried to shoot the canid, he accidentally shot one of his own cows instead. The taxidermist, Joseph Sherwood, also owned a general store in Idaho. He displayed the stuffed canid in the store, where it stayed for almost a hundred years until it disappeared. In 2007 Hutchins’s grandson, Jack Kirby, traced it to the Idaho Museum of Natural History.

The stuffed mystery canid is usually called the ringdocus, a name Sherwood made up. It has a sloping back and some other un-wolf-like features that might be due to bad taxidermy or might be due to physical anomalies in an ordinary wolf—or might be due to the ringdocus being an animal new to science. Suggestions as to what it might be include a thylacine, a hyena, a wolf-coyote hybrid, a wolf-dog hybrid, or a dire wolf. It’s not a thylacine, just going to say that straight out. Since we have the taxidermied specimen, it seems logical that a DNA test would clear up the mystery or bring us a brand new scientific mystery, if it turns out to be an unknown animal. But Kirby doesn’t want a DNA test done. That tells me it’s probably just a wolf, and he knows it’s a wolf. Prove me wrong, Kirby. I bet you ten whole dollars it’s just a wolf.

Around the same time that Hutchens was shooting at the ringdocus and killing his cow, and probably saying some very bad words when it happened, a man called Payze bought what he thought was a fox cub from some men traveling to London. It was 1883 and the men had caught the cub, along with two others, in Epping Forest. Payze named the cub Charlie, but as Charlie grew up, he started looking less and less like a fox. Payze took him to London Zoo and showed him to the superintendent, who identified him as a coyote.

But how had a coyote gotten to England? Coyotes are native to North America. The coyote is smaller than a wolf, usually a bit bigger than a fox but with longer legs, and can look fox-like. It’s gray and brown, or sometimes reddish, with large ears and a brushy tail.

It turns out that four coyotes had been brought to England and released near Epping Forest not long before, presumably for hunting. Clearly they’d had at least one litter of pups, but is it possible they survived and had more offspring? Locals do occasionally report seeing wolves or gray foxes in the area. Since coyotes readily breed with dogs and produce fertile offspring, it’s possible that some local dogs have coyote in their ancestry.

The Sri Lankan golden jackal lives in Sri Lanka and parts of India. It’s a small canid, with grizzled black and white fur above and tan or golden on the belly and legs. It’s a subspecies of the golden jackal, and it’s sometimes called the horned jackal. Local people in Sri Lanka believe that the leader of the pack has a small horn on the back of its skull, although other people report the horn is on its forehead. The horn is supposed to have supernatural powers and is considered a valuable talisman or charm.

That sounds nutty, but we actually have golden jackal skulls with small pointy horns less than an inch long, or a few centimeters. So the horns are real, but they’re not actual horns. They’re most likely bony growths resulting from an injury to the skull. No one’s sure why golden jackals grow them but not other canids.

The Falkland Islands is an archipelago about 300 miles, or 480 km, off the coast of Patagonia at the southern end of South America. When European explorers first discovered the islands in the late 17th century, no people lived there, just lots of birds and a fox-like wolf. Charles Darwin saw it in 1834 and described it as a wolf-like fox, but modern DNA research shows that it’s not only not a fox, its closest living relative is the maned wolf, which still lives in parts of South America.

The Falkland Islands wolf was tawny in color with a white tip to its tail. It had relatively short legs but was a fairly large animal, standing about two feet tall at the shoulder, or 60 cm. Its fur was thick and it barked like a dog. It may have lived in burrows. Because no mammals except the wolf lived on the Falkland Islands until settlers arrived, the wolf probably mostly ate seabirds, insects, and anything it could scavenge from the seashore.

For a long time it was a mystery how the Falkland Islands wolf got to the islands. There were no other wild canids in Patagonia, and the islands were never connected to the mainland. The islands aren’t even visible from the mainland. But the Falkland Islands wolf used to have a close relative that lived in Patagonia and other parts of South America. Dusicyon avus was about the size of German shepherd, and may have been at least partially domesticated. The grave of a young D. avus was found among human graves dating to over 2,000 years ago in Argentina. Estimates of when D. avus went extinct vary from 1,000 BCE to only around 300 years ago. Either way, researchers think that about 16,000 years ago, during the last ice age, the sea level was lower and only a shallow strait separated the mainland from the Falkland Islands. At times the strait may have frozen over, allowing animals to travel to the islands. When the glaciers melted and the sea level rose, some of the wolves were trapped on the islands. They evolved over the centuries to better fit their island habitat.

The Falkland Islands wolf wasn’t afraid of humans since it had no predators. That meant that sailors and other people who visited the islands could kill the wolves easily. It was hunted for its fur, or sometimes just poisoned by settlers who believed it killed sheep. It went extinct in 1876.

So what about the maned wolf, the Falkland Islands wolf’s living relation? It is a very weird animal, and in fact you’ll often see it listed in articles about the weirdest animals ever.

The maned wolf resembles a fox in many ways. It has reddish fur with black legs and muzzle and a black mane along its spine, a white tip to its tail, and a white patch on its throat. Its ears are big and its muzzle relatively short. Oh, and its legs are long. Really, really long. Super long. At first glance, it almost looks like a deer.

The maned wolf’s body is about the size of a good-sized dog’s, but its legs are far longer than any dog’s legs. Researchers think the maned wolf evolved longer legs to better see over the tall grasses where it lives. It’s a solitary animal and hunts small animals and birds, but about half its diet is plants. It especially likes a tomato-like fruit called the wolf apple. It marks its territory with a stinky musk that smells enough like cannabis that at least one zoo security team has mistaken it for people smoking marijuana.

Not only is the maned wolf not a wolf, it’s not a fox either. It’s not really closely related to any other living canids. It is, in fact, its own thing, the only living canid in its genus. While it’s related to the Falkland Islands wolf, its closest living relative is the bush dog, also the only species in its genus, also an odd canid from South America. But while the maned wolf is very tall, the bush dog is very short, only about a foot tall at the shoulder, or 30 cm.

The bush dog has plush brown fur that’s lighter on the back and darker on the belly, legs, and rump. Its ears are small, its snout short, and its tail is relatively short. It actually looks more like an otter or big weasel than a dog. It sometimes hunts in packs, sometimes alone. When it hunts alone it mostly eats small rodents, lizards and snakes, and birds, but packs can kill larger animals like peccaries, a type of wild pig. It lives in extended family groups and hunts during the day.

The bush dog is rare and not much is known about it. Its toes are webbed and it spends a lot of time in the water within its forest habitat. It’s so rare that for a long time it was only known from fossils found in some caves in Brazil, and was thought extinct.

Conversely, the Japanese wolf, or Honshu wolf, is a canid that is supposed to have gone extinct in January of 1905 when the last known wolf was killed. But people keep seeing and hearing it in the mountains of Japan.

The Honshu wolf was also small, not much more than a foot tall at the shoulder, or 30-odd cm, but it was a subspecies of gray wolf. Its legs were short and its short coat was greyish-brown. It was once considered a friend to farmers, since it ate rats and other pests. Wolves were also regarded as protective of travelers in Japanese folklore. But in 1732 rabies was introduced to Japan. That disease combined with loss of habitat made the Honshu wolf more of a threat to humans and their livestock, and led to its persecution.

But sightings of the wolf have continued ever since that last one was killed in 1905. Photographs of a canid killed in 1910 were studied by a team of researchers in 2000, who determined that the animal in the photos was probably a Honshu wolf. People have found tracks, heard howling, seen wolf-like animals, even taken photos of what look like wolves. The problem is that the Japanese wolf looked similar in many ways to some Japanese dog breeds like the Shiba inu and the Akita, which are probably partly wolf anyway since wolves and dogs interbreed easily and produce fertile offspring. People might be seeing dogs roaming the countryside. We can’t even DNA test hairs and old pelts to see if they’re from wolves, because we don’t have a genetic profile of the Honshu wolf. There are only a few taxidermied specimens of the wolf, and none of them have yielded intact DNA.

Another mystery not definitely solved by DNA testing, although at least they’ve tried, is the Andean wolf, sometimes called Hagenbeck’s wolf. It’s another South American mystery canid. In 1927, a German animal collector called Lorenz Hagenbeck bought a wolf pelt in Buenos Aires. The seller said the pelt, and three others, came from a wolf-like wild dog in the Andes Mountains.

The pelt is about six feet long, or 1.8 meters, including the tail, with thick, long fur, especially a thick ruff on the neck. It’s black on the back and dark brown elsewhere.

Hagenbeck didn’t recognize the pelt, so when he got home he sent it for examination. In the 1930s and 1940s, various studies suggested it belonged to a new species of canid, possibly one related to the maned wolf. One mammologist, Ingo Krumbiegel, also thought he might have seen a skull of the same canid in 1935, which he said had resembled a maned wolf skull but was much larger, and was supposed to have come from the Andes. Krumbiegel was convinced enough that in 1949 he described the Andean wolf formally as a new species. But no more specimens have come to light.

In 1954 another study determined Hagenbeck’s pelt was just a dog pelt, possibly of a German Shepherd crossbreed. A 1957 study came to the same conclusion. In 2000, a DNA analysis came back inconclusive due to the pelt having been chemically treated during preparation, and contamination with dog, wolf, human, and pig DNA. Currently the pelt is on display at the Zoological State Museum in Munich.

Finally, the dire wolf is a famous canid from books, games, and movies, but it was also a real animal. It lived throughout North and South America and was bigger than modern gray wolves, standing over three feet tall at the shoulder, or about 97 cm. It had massive teeth and powerful jaws that would have helped it kill giant ground sloths, mastodons, bison, horses, and other ice age megafauna. It wasn’t as fast a runner as modern wolves, though, and some researchers think the gray wolf may have outcompeted the dire wolf.

The dire wolf probably died out about 9,500 years ago, but there’s a group called the Dire Wolf Project that’s attempting to breed a dog that looks like a dire wolf. The group isn’t introducing any modern wolf genes into the breed, though, since they want a dog that looks like a dire wolf but doesn’t act like one. Which is pretty smart considering that dire wolves probably snacked on our own ancestors from time to time.

You can find Strange Animals Podcast online at strangeanimalspodcast.com. We’re on Twitter at strangebeasties and have a facebook page at facebook.com/strangeanimalspodcast. If you have questions, comments, or suggestions for future episodes, email us at strangeanimalspodcast@gmail.com. If you like the podcast and want to help us out, leave us a rating and review on Apple Podcasts or whatever platform you listen on. We also have a Patreon if you’d like to support us that way.

Thanks for listening!

Episode 079: Starfish and Friends

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This week’s episode is all about echinoderms, or at least the star-shaped echinoderms! Thanks to Llewelly for the suggestion about feather stars and crinoids!

A very pretty starfish:

Crown of thorns starfish. Do not touch:

Pumpkin starfish or orange throw pillow? YOU DECIDE:

Sea daisies. Not much to look at tbh:

A banded arm brittle star:

Ruby brittle stars:

Brittle stars riding around in a jelly:

A basket star:

Basket stars got TEETH THINGS:

A stemmed crinoid:

A lovely feather star:

Further reading:

Echinoblog, a really amazing resource and so much fun to browse

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

This week we’re going to look at some marine animals that most people barely think about, but which are really interesting. It was going to just be about starfish and maybe one other animal, but while I was still researching starfish, listener Llewelly suggested I cover feather stars and crinoids. They’re related to starfish, so I thought I’d tack them on. And if you talk about starfish, you really have to talk about brittle stars too, and if you talk about brittle stars you have to talk about basket stars. Basically, I had to stop myself from breaking this episode into two big episodes about echinoderms. It’s just the stars this time.

Before we get into echinoderms, though, a quick note about my schedule. Next week I’m going on a trip to Paris, France! I know it sounds like I’m rich and just travel as my whim takes me, but actually I just have really generous relatives. A week and a half after I return from Paris, I’ll be in Atlanta, Georgia for DragonCon, where I’ll be on a panel about podcasting. In other words, I won’t be around much on social media for the rest of August, but don’t worry, I’ll have episodes recorded and scheduled to run normally while I’m gone.

Okay, now let’s get into echinoderms. Echinoderms include sand dollars, sea urchins, starfish, and many others, and every single echinoderm lives in the ocean. Many of them can regenerate limbs and other body parts, and instead of blood they have a water vascular system. In most echinoderms, seawater enters the body through slits or pores, then travels through canals within the body to transport oxygen to cells and waste products out of cells. Echinoderms have internal skeletons made of calcium carbonate, but they’re invertebrates because they don’t have a backbone. Heck, technically they don’t even have a back.

Echinoderms show radial symmetry, which means their bodies are roughly the same in all directions instead of having a clear front and rear. The echinoderms we’re talking about this week are ones that also exhibit pentaradial symmetry, which means they have five sides. And the best-known echinoderms out there are starfish. There are about 1,500 species of starfish known, and some of them are really weird and some are only kind of weird. Most have five arms but some have a whole lot more.

Starfish are members of the class Asteroidea, which just delights me. A better name for them is sea star, since they’re not fish at all. Starfish have been around for at least 450 million years, but in 2012 paleontologists found a fossil of the oldest known ancestor of starfish in the mountains of Morocco. It’s about 515 million years old, from the Cambrian period. It was only about an inch and a half long, or 4 cm, and looked similar to the modern-day sea lily, or crinoid. If you recall, the Cambrian period was when life was expanding rapidly in the oceans and evolving sometimes quite strange body plans. You know, like things with FIVE LEGS.

Most starfish have ossicles in their skin, little hard beads of calcium carbonate that help protect the animal. In some starfish, the ossicles are more like spines or even spikes. Although cartoons of starfish usually make them look like their legs are always exactly star-shaped, the legs are actually quite flexible. If a starfish is flipped upside down, it bends a couple of its legs down to flip itself back over.

The starfish’s mouth is in the very center of its body, the part in the middle of the legs, known as the disc. Different starfish use their mouths differently. That sounds confusing, but just hang on, because things are about to get weird and gross.

Starfish are primarily predators. Some starfish just swallow their prey whole and digest it in the stomach. Pretty normal. But other starfish—look, I don’t know how to tell you this, so I’ll just say it. They turn their stomach inside out, called eversion, squish it around the prey, and start the digestive process. Part of the stomach stays inside the body, and when the prey has been digested enough that’s it sort of a lumpy soup, the starfish retracts its everted stomach and the food back into the body. This means that the starfish can eat prey that’s bigger than it is.

A lot of starfish eat bivalves of various kinds, like clams. Say a starfish finds a clam and wants to eat it. The clam is closed up tight and starfish don’t have teeth or claws to break the clam open. But starfish do have tiny tubes on the bottoms of their legs, called tube feet. These tubes act like suction cups, although they actually stick to things with a chemical reaction. So the starfish latches onto both shells of the bivalve with its tube feet and pulls. It probably isn’t strong enough to pull the clam open completely, but it doesn’t need to. It just needs a little space so it can evert its stomach and squish it into the clam’s shell. Then it releases digestive enzymes and the clam is doomed.

Starfish can’t move very fast, and lots of animals eat them. But they can regenerate lost legs if some of them are bitten off. The starfish doesn’t have a brain, although it does have a nerve net. Plus, it has sensory bundles at the ends of its arms that can detect smells, along with eye spots at the end of each leg. The eye spots basically just detect light and darkness and they don’t actually look like eyes, which is a good thing because that would be terrifying.

Starfish arms, or legs, are properly called rays. I will continue to confuse everyone by calling them arms or legs depending on which word sounds better to me at the time.

So let’s get down to the nitty-gritty. What is the biggest starfish? What is the weirdest starfish? Could a starfish actually kill you, and I don’t mean by making you faint with terror and drown, which is what would happen to me if I accidentally touched one.

Let’s start with the biggest starfish. Starfish don’t actually get all that enormous. Even the biggest ones are typically only about two feet across, or 60 cm. The sunflower star can grow more than three feet across, or over a meter, and can weigh up to 11 pounds, or 5 kilograms. AND it has a ridiculous number of arms, up to 24 of them.

Sunflower stars can be purple, red, pink, brown, orange, yellow, or even white. They live on the sea bed along the Pacific coast, usually where it’s shallow but sometimes nearly 1500 feet deep, or over 450 meters. Young sunflower stars only have five arms, but as they get older they grow more arms. One genus of starfish, commonly called Heliaster, looks similar to the sunflower star even though it’s not that closely related to it, but some individuals can have up to 50 legs.

Recently, a bed of 350 fossil starfish were found in Florida, so well preserved that paleontologists were able to identify them as Heliaster michrobachius, which is still around today. But it lives off the western coast of Central and South America, from Mexico all the way down to Chile—but it’s not found anywhere else. So what were they doing in Florida three million years ago?

Remember the Great American Interchange, where the isthmus of Panama formed, connecting North and South America and allowing animals from both places to spread into the other continents? Before then, North America was separate from South America, so Heliaster undoubtedly lived along North America’s southern coast. After the isthmus formed, currents, salinity, and many other factors changed, which probably led to Heliaster dying out in the Atlantic side of the continent. Fortunately, it survived in the Pacific side.

So, what is the weirdest starfish? It’s really hard to decide. All starfish are weird, frankly. Labidiaster annulatus can grow up to two feet across, or 60 cm, and has 40 to 45 long, thin legs with sharp spines that can actually grab prey. The starfish holds its legs out and wriggles them like fishing lines, and when a little fish or an amphipod comes close, the spines snag it. The starfish wraps its arms around the prey and pulls it to its mouth, where it everts its stomach and starts digesting.

The crown-of-thorns starfish mostly eats coral polyps and is covered with thorny spines that are venomous. It can have up to 21 arms and is the same size as Labidiaster, but with a thicker body and much shorter legs. It looks scary, but it’s actually delicate and rarely survives being lifted out of the water for even a short time. It lives in a lot of areas, including part of the Pacific Ocean, Red Sea, and along the east African coast, but it’s most common around Australia. At one point people worried that it was killing a lot of the coral in Australia’s great barrier reef, but under ordinary circumstances it actually helps maintain biodiversity in coral reefs by preying mainly on fast-growing coral. This allows slow-growing coral to flourish. Every so often, though, there’s a population boom among the crown-of-thorns starfish. Researchers aren’t sure why, and when it happens Australia has tried various population control measures to keep their numbers down and protect the reefs.

The pumpkin sea star is fat, thick, and orange. It’s big too, literally the size of a pumpkin. It’s also rare, and was only discovered in 1997. Even though it’s big, its skeleton is very small and it’s basically very meaty, which makes it look like a star-shaped orange throw pillow. Now I want a pumpkin starfish throw pillow. It lives in the Indo-Pacific up to about 650 feet deep, or 200 meters, but not much is known about it yet.

Luidia maculata has long, flattened arms that are brown and black striped above and white underneath, sometimes with a brown daisy pattern on its body disc. Seriously, who knew these things were so pretty? It lives in shallow water in the Indo-Pacific and often buries itself in the sand with the help of the long spines on the undersides of its legs. It doesn’t have an eversible stomach so it just swallows its prey whole, including sand dollars, sea urchins, clams, other starfish, sea cucumbers, and snails. Whatever’s left over after it has digested its prey, it spits out.

The sea daisy is a deep-sea animal described in 1986 after being discovered by accident. A team collecting samples of wood from the South Pacific seabed found nine of the strange creatures and didn’t know what they were. It’s small, only about 9 mm long, and is shaped roughly like an umbrella without a handle. Its upper surface is covered with plates with spines along the edges, and underneath it has a single row of tube feet and a membrane. Researchers at first decided the sea daisy was so different from other echinoderms that it needed its own class, but further study determined that it’s actually a type of starfish even though it has no arms and no stomach. In fact, it most closely resembles a juvenile starfish, but where starfish grow arms as they develop, the sea daisy never grows arms and instead grows outward along its circumference, like a wheel. It lives among wood that has sunk to the bottom of the ocean to a depth of at least 3300 feet, or 1,000 meters, and researchers think it may eat bacteria that grow on the wood. The membrane on its underside resembles an everted stomach.

Okay, one more. A starfish sometimes referred to as a slime star is covered with a soft, squishy, gelatinous surface. Its body is frequently almost transparent too. It usually lives in the deep sea, with new species found just about every time a deep-sea expedition scouts around on the sea floor. The largest are almost a foot across, or nearly 30 cm. Since they’re so delicate, it’s hard to study them, so not a lot is known about them. But there is a shallow-living species that has been studied a little more, and we know one important thing about them. If you pick up a slime star, it will secrete just ridiculous amounts of slime. This helps it keep from being eaten. The slime may also contain a soap-like toxin.

That brings us to our last question about starfish: can starfish kill you? No. No, they can’t. Even the crown-of-thorns starfish venom won’t kill you, just hurt like crazy for a few hours or as much as a week. The venom actually chemically resembles soap or detergent so isn’t very toxic to humans or other animals, but it does make the starfish taste bad.

Next, let’s look at brittle stars. Brittle stars look superficially like starfish and are closely related to them. Their legs are usually very long and slender, with the legs of some species growing up to two feet long, or 60 cm. The legs are supported by a skeleton made of plates called vertebral ossicles, which resembles a bike chain.

Brittle stars have five arms and a round central disc, with the legs much more differentiated from the disc than starfish legs are. They mostly scavenge for bits of food or eat worms and other small animals. They usually move slowly, but when they need to, they can really zoom around quickly. Their legs are extremely flexible and they can use them for swimming or crawling. Sometimes a brittle star will raise its body disc up and walk on its legs sort of like a spider, which is oddly creepy but also remarkably adorable. Look, I don’t mind telling you, I really like brittle stars. I barely knew what they were before I started researching them, but now I think they’re one of the best things ever.

Some brittle stars are bioluminescent, but only along their arms. Most species can regenerate their arms like starfish can, but not as well as starfish, and some species can’t regenerate at all.

Brittle stars are more freewheeling than their starfish cousins. For instance, one brittle star, Ophiocnemis marmorata, hitches rides on jellyfish. One 2017 study found that 79% of moon jellies examined hosted brittle stars, some riding inside the jellys’ bells, some riding in the tentacles near the oral arms. Larger jellies carry more brittle stars, while small ones usually only have a few. It turns out that the brittle stars steal food from the jellies, known as kleptoparasitism. They also gain some protection from living inside a jelly, and they get a free ride to new parts of the ocean. Researchers hypothesize that the brittle stars find their jelly hosts as larvae, ride around with it for a while, and drop off to live on the sea floor. Since the brittle star prefers tropical waters, it abandons its host jelly when it migrates into colder water.

Brittle stars are divided into two groups, brittle stars and basket stars. Brittle stars live all over and are especially common around coral reefs, but basket stars mostly live in deep water. While brittle stars have relatively simple, snakey arms, basket star arms are long and branched. Sometimes the branches of their arms are so elaborate, they look more like a kind of coral or like a tumbleweed sitting on the bottom of the ocean.

The biggest basket star we know of is probably Gorgonocephalus. There are at least ten species, and they can be hard to tell apart even by experts. Gorgonocephalus’s body disc can grow some 5 ½ inches across, or 14 cm, but its five net-like arms can grow over two feet long, or 70 cm. It’s white or yellowish in color, and its disc is often dark brown. During the day it hides among sponges and corals, but at night it comes out to hunt.

Basket stars mostly eat small animals like krill, jellyfish, and copepods that get tangled in their elaborately branched arms. The arms have hooks and spines all over them too. Basket stars will sit on a rock or a sponge or something similar, and extend their arms as though casting a net. When an animal strays into the net, the basket star carries it to the mouth on the underside of its body disc. And the mouth is full of spikes. Like many deep-sea animals, we don’t know a whole lot about basket stars and new species are discovered pretty frequently.

The last star we’ll look at this time is the feather star, but to learn about the feather star we also have to learn about the crinoid. If you’ve taken a geology class, you probably remember crinoid stem fossils. They’re incredibly common fossils, because crinoids used to be incredibly common animals. Pieces of crinoid stem fossils are sometimes called St. Cuthbert’s beads, and they’ve been used by humans to make jewelry for millennia.

In the past crinoids had five arms, but at some point each arm developed into two, so many modern crinoids have ten arms. In addition, some species have arms that branch. The arms have feathery appendages and tube feet coated with mucus, which helps trap tiny bits of food. Crinoids’ water vascular system is internal, unlike in starfish and brittle stars, which pump water in from outside.

Crinoids with stalks look like plants and are often called sea lilies. Some even have tiny rootlike filaments that help it attach to the sea floor or to rocks or other structures. The stem is slender with the cup-like body disc, called a calyx, and feathery arms at the top. Many species of crinoid have stems as juveniles, but become free-swimming when they reach maturity. Today some deep-sea crinoids can have stems a little over three feet long, or roughly a meter, but one fossil crinoid found had a stem 130 feet long, or 40 meters. But unlike true plants, crinoids can uproot themselves and move to a better location.

Most crinoids today are free-swimming, and these are the feather stars. They may have a vestigial stalk or may have no stalk at all. Most feather stars are sedentary, only crawling around for short distances, but some can swim with their arms. Many are brightly colored and absolutely beautiful.

I could keep talking about echinoderms for hours, but this episode is already getting long. Eventually I’ll do a follow-up episode about other echinoderms, like sea urchins. Until then, if you want to learn more about echinoderms I highly recommend a site called Echinoblog. It’s run by Dr. Chris Mah, a starfish expert, whose enthusiastic and informative posts about echinoderms really helped me learn to appreciate them. I’ll put a link in the show notes. Usually, the more I look at pictures of invertebrates, the more gross they seem, but the opposite is true for feather stars and brittle stars. They’re just gorgeous. Starfish, on the other hand, I would rather admire from afar.

You can find Strange Animals Podcast online at strangeanimalspodcast.com. We’re on Twitter at strangebeasties and have a facebook page at facebook.com/strangeanimalspodcast. If you have questions, comments, or suggestions for future episodes, email us at strangeanimalspodcast@gmail.com. If you like the podcast and want to help us out, leave us a rating and review on Apple Podcasts or whatever platform you listen on. We also have a Patreon if you’d like to support us that way.

Thanks for listening!

Episode 078: The Great Auk and Penguins

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Let’s learn about the great auk this week, along with some lookalike birds, penguins!

A great auk, as painted by Audubon:

A razorbill, the auk’s closest living relative:

A fairy penguin, so tiny:

An emperor penguin, so big:

Tony Signorini wearing his Hoax Shoes:

Show transcript:

Welcome to Strange Animals Podcast. I’m your host, Kate Shaw.

This week’s topic is one I’ve had on my list to cover for some time, and a couple of people whose names I forgot to write down also suggested. It’s the great auk, and while we’re at it we’re going to learn about penguins too.

Picture this bird in your mind. It’s big, close to three feet tall, or 85 cm, black with a white belly and white spots over the eyes during breeding season. It has a big dark bill and eats fish and crustaceans. Its feet are webbed and it’s flightless, because instead of flying, it swims, fast and agile in the water but clumsy on land. It’s social, nesting in big colonies and laying one egg, which both parents incubate. Both parents also help feed the chick when it hatches. Pairs mate for life. And it lives in cold waters of the North Atlantic from eastern Canada to Greenland and Iceland over to the western coast of Europe.

Wait a minute, you say, knowledgeably, because you know a thing or two about penguins. Penguins live in the southern hemisphere. What is going on??

The great auk is going on, my friend. And while the similarities between the great auk and the various species of penguin are striking, they’re not closely related at all. The great auk’s scientific name is Pinguinus impennis, and it was sometimes called a penguin, but the penguin is named after the auk because of the similarities between the two. The most obvious difference between the great auk and the penguin is the bill. Penguins have relatively small, sharp bills, but great auk bills were much larger and heavier, grooved and with a hook at the end.

So is the great auk still around? I sure made it sound like it was still around, didn’t I? Unfortunately, no. The last known great auks were killed on June 3, 1844, with a few sightings in the years after. The last probable sighting of a great auk was in 1852. But it had been a really common bird for a long time. What was it like, and what happened to it?

The great auk lived almost its whole life in the water. It only came out to breed and lay eggs, one egg per couple. Its babies grew fast and took to the sea when only a few weeks old, but the parents continued to feed their baby and care for it in the water. Sometimes a young auk would ride on its parent’s back as it swam.

It was incredibly at home in the water. It could hold its breath for something like 15 minutes, could dive deeply and swim so quickly that it could shoot up out of the water to land on ledges well above the ocean’s surface. Because of its swimming ability and its size, it wasn’t scared of very many animals. Polar bears, orcas, and a few other large predators sometimes ate it, but its main predator was these aggressive apes called humans. Maybe you’ve heard of them.

People killed the great auk for food, for feathers, and to use its skin and bones as decorative items. Its remains have been found at Neandertal campsites too. And because it was a large, plentiful bird, people hunted it and hunted it and hunted it. The great auk was already nearly extinct around Europe by the mid 16th century, since it was killed for its down, which was used to stuff pillows. Auk eggs were also collected for food. And as the bird became rarer, museums decided they had better get specimens while they could. The last great auks were killed so they could be stuffed and mounted.

So if there’s a great auk, is there a lesser auk? There is, and it’s still around! The little auk is only about 8 inches long, or 21 cm, but unlike the great auk it can fly. It eats small fish, crustaceans, and invertebrates. But the razorbill is a much closer relative.

The razorbill has a lot in common with the great auk but it’s much smaller, only up to 17 inches high, or 43 cm. It also flies. It was once hunted for its meat and feathers, but after it was protected in 1917 its numbers rebounded. Its primary problem these days is pollution of its breeding sites.

There was once a group of even bigger auks than the great auk. The Mancallinae were flightless and lived on the western North American coast. The largest species was Miomancalla howardae, which went extinct almost 5 million years ago. It stood more than three feet tall, or 1 meter, but was heavier and bulkier than the great auk.

As for penguins, fortunately, they’re still around although they’re all threatened due to pollution, habitat loss, and climate change. They have no natural fear of humans, probably because they have no land predators in Antarctica. Polar bears and walruses live near the Arctic, which is in the northern hemisphere, and sled dogs aren’t allowed in Antarctica. I did not know that until just now. I mean, I knew the polar bears and walruses part, not the dog part.

The smallest penguin is called the fairy penguin, and it’s only 16 inches tall at most, or 40 cm. It lives off the coast of Australia, New Zealand, and Chile. Its head is blue, which is why it’s also called the little blue penguin. Like other penguin species, it eats fish, cephalopods like squid, and crustaceans such as krill. It especially likes jellyfish.

The largest penguin is, of course, the emperor penguin, famous from March of the Penguins. If you haven’t seen that documentary, you’ll learn lots of things about emperor penguins and will also cry. The march in the  title is the migration the penguins take to breeding colonies, where they may walk over the ice up to 75 miles, or 120 km. Penguins are not very good at walking, either. Once they’ve reached the breeding colony, each female lays one small egg, which has a thick shell. The male has a brood pouch to keep the egg warm, basically a fold in his skin above his feet. The egg sits on his feet with the rest of it in the brood pouch. After that, the female leaves to go hunting, because making her egg takes a lot out of her and she needs to replace her body reserves. The male incubates the egg by himself.

It gets really cold in the Antarctic during winter. Seriously, really cold, as cold as -40 degrees. Negative 40 is the same temperature in Celcius and Fahrenheit, which is kind of neat. Emperor penguins choose breeding colonies that are protected from the wind as much as possible, but they still have to deal with wind gusts of 90 mph, or 145 km per hour. To withstand the cold, penguins have dense feathers and a thick layer of blubber. Males huddle together for warmth, with every penguin getting a turn to be on the inside of the crowd where it’s warmer, and spending their fair share of time on the edges of the crowd where it’s colder. During the two months after eggs are laid, males don’t eat anything. When his egg hatches, the male feeds the baby with crop milk, which you may remember from episode 19, about the dodo. Crop milk isn’t milk at all, but a nutritious substance formed from a parent bird’s esophagus. Only male emperor penguins produce crop milk.

A short time after the eggs hatch, female emperor penguins return from hunting. The female takes over care of the chick, feeding it with regurgitated food, so the male can leave to go hunting. Males and females trade off in this way for a couple of months, until the chick is old enough and big enough to be left alone for stretches.

The emperor penguin lives in Antarctica and can grow over four feet tall, or 130 cm, which is just ridiculously large. It can also weigh up to 100 lbs, or 45 kg. In other words, it’s as big as a small person and much bigger even than the great auk was. It’s a strong swimmer and can dive deeply—the deepest recorded dive was well over 1800 feet, or 565 meters, which is whale diving depth.

But the emperor penguin isn’t the biggest penguin that ever lived. Anthropornis went extinct around 33 million years ago, and it was a penguin that was actually the height of a tall human, some six feet tall, or 1.8 meters. It lived off the coast of what is now New Zealand and Antarctica. The New Zealand giant penguin probably lived around the same time as Anthropornis, and was around five feet tall, or 1.6 meters, but probably weighed more. Neither were direct ancestors of modern penguins, but they probably looked and acted very similar. Just, you know, enormous.

A newly discovered giant penguin, also from New Zealand, lived much earlier than the others. It was already almost five feet tall, or 1.5 meters, and well adapted to the water 61 million years ago. Remember that the Cretaceous-Paleogene extinction event occurred around 66 million years ago. Some researchers hypothesize that penguins had already begun evolving when dinosaurs were still alive, and that they survived the extinction event.

Another extinct penguin, one that was more directly related to modern penguins, lived around South America some 36 million years ago. Icadyptes was almost as tall as the other giant penguins and had a bill that was much longer and pointier than modern penguin bills, more like a heron’s bill. It also lived in much warmer waters than most modern penguins.

Back in the 1920s and 30s, when fossils of giant penguins were first described, they caught the public’s imagination. Giant penguins appeared in science fiction of the day, including Jules Verne and HP Lovecraft. Starting in February of 1948, people in Florida began finding enormous three-toed tracks in sand on a few beaches and along the Suwannee River. The footprints were over a foot long, or 35 cm, and the animal’s stride was measured at between 4 and 6 feet long, or 1.2 to 1.8 meters. Cryptozoologist Ivan T. Sanderson examined the tracks in November of 1948. After weeks of study he reported gravely that they’d been made by a penguin 15 feet tall, or 4.5 meters.

It turns out, though, that it was all a hoax. Two men named Tony Signorini and Al Williams had made gigantic iron feet they could wear as great big shoes, and walked in the sand overnight leaving trails of monstrous tracks ready to be discovered by beachcombers. They actually intended the tracks to be taken for dinosaur or sea monster footprints, but a giant penguin was even better. Each foot weighed about 30 lbs, or 13.5 kg, and Signorini used the weight to swing along in a sort of controlled bound that made his stride remarkably long without too much effort. Williams died in 1969 but Signorini didn’t come clean about the hoax until 1988.

He still has the feet.

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Thanks for listening!