Category Archives: South America

Episode 098: River Dolphins

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This week let’s learn about some unusual cetaceans, river dolphins!

An Amazon river dolphin and the nose of another Amazon river dolphin:

Another Amazon river dolphin. Note the teeny eye and disk-like teeth:

A South Asian river dolphin. Note the almost nonexistent eye:

A Chinese river dolphin in better days:

Show transcript:

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

This week we’re going to learn about an animal I’ve wanted to cover for a long time but never got around to, the river dolphin.

All whales and almost all dolphins live in the ocean. They can survive for a short while in fresh water but need saltwater to thrive. But as the name suggests, the river dolphin lives in rivers, usually in fresh water and sometimes in the brackish water where rivers empty into oceans. Brackish just means a mixture of fresh and salt water, so it’s saltier than fresh water but not as salty as ocean water. When I was a kid I thought it meant ocean water with a lot of seeweed and dead leaves in it, because I thought the word brackish had something to do with bracken, which is a type of fern.

There are only a few species of river dolphin alive today. They live in warm water and have very little blubber as a result. They primarily use echolocation to navigate since river water tends to be muddy and hard to see through. Their flippers are broad and most have long snouts and flexible necks, or at least flexible compared to other cetaceans. All river dolphins are endangered due to pollution, habitat loss, and accidental drowning in fish nets, with the Chinese river dolphin only having been declared extinct in 2006.

River dolphins evolved from dolphins that once lived in the ocean, but most aren’t closely related to the marine dolphins alive today. Researchers think that when modern dolphins and other toothed whales evolved, they outcompeted their more primitive cousins, who moved into freshwater habitats as a result.

A few years ago, fossils of an extinct river dolphin that grew more than nine feet long, or almost three meters, were found in Panama. It lived around 6 million years ago in the Amazon River, but researchers don’t think modern river dolphins are closely related to it. In other words, freshwater dolphins have evolved repeatedly in different parts of the world to fit an available ecological niche.

In the case of the newly discovered fossil river dolphin, Isthminia panamensis, it probably lived in the warm, shallow Caribbean Sea between North and South America before the Isthmus of Panama formed. It took millions of years for the isthmus to form, with undersea volcanos first emerging from the ocean around 15 million years ago to form islands, then the land itself being pushed upward as the Pacific Plate slid underneath the Caribbean Plate. Researchers think the isthmus became fully formed around 3 million years ago, separating the Atlantic Ocean from the Pacific and connecting North and South America. Because we have Isthminia panamensis’s fossil from the Amazon River, we can hypothesize that by around 6 million years ago, there wasn’t enough of the original Caribbean Sea habitat to support the dolphins and they had already moved into the Amazon River and adapted to life in freshwater.

The river dolphin isn’t the only cetacean that lives in freshwater. There’s a species of porpoise called the finless porpoise that lives around Asia in shallow coastal waters, but often spends at least part of the time in mangrove swamps and in rivers not too far from the sea. Porpoises and dolphins look very similar but belong to different families, which means they aren’t actually very closely related at all. Like, seriously not related at all. Like, the difference between horses and cows. The finless porpoise can grow almost seven and a half feet long, or over two meters, and is called finless because it doesn’t have a dorsal fin. Instead, it has a dorsal ridge lined with tubercles, or bumps, that contain nerve endings. Researchers don’t know what purpose the tubercles serve. Porpoises use echolocation but their clicks are much higher in frequency than dolphins’, so high that humans can’t hear most of them.

There are three families of river dolphins still living today, Platanistidae, Iniidae, and Pontoporiidae.

Platanistidae are the Indian dolphins, with only one species alive today. The South Asian river dolphin lives in South Asia. There are two subspecies, the Ganges River dolphin and the Indus River dolphin. Young South Asian river dolphins have sharp, thin teeth, but as the dolphin matures, its teeth become flatter and squarish, almost like disks. It eats fish, crustaceans like shrimp, and some dolphins may also eat water birds and even turtles. Its rostrum, the word for a cetacean’s beak, is considerably longer in females than in males, sometimes like 8 inches longer, or about 20 cm.

The South Asian river dolphin is sometimes called the blind dolphin because its eyes are basically only useful for sensing light. They don’t even have lenses. It has a very small dorsal fin, not much more than a bump, a powerful tail, and is brown in color, and grows up to ten feet long, or almost 3 meters. It uses echolocation to navigate in the murky river water and find prey. It also usually swims on its side, which also gives it the name side-swimming dolphin. It does this so it can trail the tip of a flipper along the river bottom to feel for shrimp and mollusks.

It’s such an unusual dolphin, even for river dolphins, that researchers are studying fossil dolphins to figure out how the South Asian river dolphin evolved. Two years ago, a fossilized dolphin skull found in 1951 in Alaska and held in the Smithsonian’s collection ever since was evaluated and determined to be a distant relative of the South Asian river dolphin. It lived about 25 million years ago, around the time that ancient whales were evolving into the two groups we have today, toothed whales, which includes dolphins, and baleen whales.

The South Asian river dolphin has been evolving separately from marine dolphins for at least the 25 million years since its relative was swimming around in the Arctic Ocean. Research on its echolocation suggests that the Ganges River subspecies of the South Asian river dolphin probably has biosonar that more closely resembles that of ancient toothed whales than modern toothed whale and dolphin echolocation does. It has a much deeper voice than marine dolphins of about the same size have.

I tried very hard to find a recording of a Ganges River dolphin, or any South Asian river dolphin, but all I found was this, the echolocation of an Amazon river dolphin:

[river dolphin sound]

The Amazon river dolphin is a member of the Iniidae family of river dolphins. It’s the biggest of the river dolphins, and adults are often pink in color. In all other river dolphins, and most cetaceans in general, females are larger than males, but male Amazon river dolphins are larger than females. Babies are dark gray, fading to lighter gray as they grow up. Adults can appear pink because the skin is often pale and in warm water, the blood shows through the skin. The Amazon river dolphin has small eyes, but it sees a lot better than the South Asian river dolphin.

Most river dolphin species aren’t nearly as sociable as marine dolphins and are usually only found singly or in groups of two or three. Male Amazon river dolphins often fight each other when females are around. If a male Amazon river dolphin meets some females, he will pick up a branch or stone and carry it around to impress them.

Amazon river dolphins eat fish, including piranhas, freshwater crabs, turtles, and other small animals. Sometimes a dolphin will participate in cooperative hunting with giant otters and the tucuxi, another species of dolphin that lives in the Amazon basin. The three species eat different types of fish so they all benefit from hunting together.

The tucuxi isn’t actually a river dolphin although at least some individuals live in rivers. It’s considered a marine dolphin, and you can tell the difference just by looking at it. It looks like a small bottlenose dolphin, about five feet long, or 1.5 meters, and unlike river dolphins its rostrum is relatively short.

The third family of river dolphin is Pontoporiidae, and there’s only one species alive today. Just to show that nature isn’t cut and dried, the La Plata dolphin doesn’t always live in fresh water. It lives around the coast of southeastern South America and while some do spend their whole lives in rivers, most La Plata dolphins live in the ocean.

Finally, let’s talk about the Chinese river dolphin, the one that’s recently extinct, also called the baiji. Technically it’s functionally extinct because although there may be one or two still alive, there aren’t enough to continue the species into another generation. River dolphins do very poorly in captivity, usually dying within months, so even if conservationists had billions of dollars and the cooperation of every single person on earth to save the Chinese river dolphin, there’s nothing they could do at this point. In fact, in 2006 a research team searched for the dolphin for six weeks to put a conservation action plan into place for it, but they didn’t find any. That’s when it was declared extinct.

The Chinese river dolphin lived in the Yangtze River and grew up to 8 feet long, or 2.4 meters. It was blue-gray with a paler belly, and like many other river dolphins, its rostrum was slightly upturned. It also had poor vision. It was once common along much of the Yangtze, some 1,100 miles of river, or 1,700 km, but massive increases in pollution of the river, collisions with boats caused by the noise of boats overwhelming the dolphins’ echolocation, poaching, entanglement in fishing nets, loss of habitat due to damming of the river, and overfishing drove it to extinction within about five decades. The last confirmed sighting of a Chinese river dolphin was in 2002, with an unconfirmed sighting in 2007.

This is a depressing way to end the episode, so let’s finish up with a long-ago relative of the South Asian river dolphin. Zarhachis flagellator lived during the Miocene, about 16 million years ago, and had a really long rostrum. Like, super super long. Its skull was about four feet long, or 1.2 meters, which makes it sound like it must have been a really big dolphin, but it wasn’t. Its actual braincase was less than a foot long, maybe 8 inches or so, or 20 cm. The rest of the length was rostrum. In other words, it had a head about the size of your head, and a long thin beak full of sharp teeth that was something like three feet long, or almost a meter. Tonight when you brush your teeth, think about that. Think about how hard it would be to reach all your teeth if you had a mouth that stuck out three feet from your head. You’d need a really long toothbrush.

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. We also have a Patreon if you’d like to support us that way.

Thanks for listening!

Episode 097: Unusual Reptiles

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Thanks to listeners Finn and Leo, who suggested this week’s topics of strange lizards, and the thorny devil and mata mata turtle, respectively! Join us this week to learn about those reptiles and a bunch more!

Thorny devil. Definitely do not eat.

The mata mata turtle. Big leafhead boi

A frilled lizard BWAAAAAMP

A Pinocchio lizard. Wonder where that name comes from.

Poke poke poke does this bother you? poke poke

om nom nom

A shingleback, or as I like to call it, an ambulatory poop:

Show transcript:

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

We have more listener suggestions this week! Ages ago, listener Finn suggested strange lizards, and more recently, listener Leo suggested a particular type of strange lizard and a strange turtle.

We’ll start with Leo’s suggestion, the thorny devil. He describes it as “a cool animal with spikes all around it,” which is definitely a good way to put it. The thorny devil is a lizard from Australia, and it does indeed have spikes all over its head, back, and tail, and smaller spikes on its legs. The spikes are modified scales and are sharp.

The thorny devil grows to around 8 inches long, or 20 cm, with females being larger than males on average. In warm weather its blotchy brown and yellow coloring is paler than in colder weather, when it turns darker. It can also turn orangey, reddish, or gray to blend in to the background soil. Its color changes slowly over the course of the day as the temperature changes. It also tends to turn darker if something threatens it.

It has a thick spiny tail that it usually holds curved upward, which makes it look kind of like a stick. It moves slowly and jerkily, rocking back and forth on its legs, then surging forward a couple of steps. Researchers think this may confuse predators. It certainly looks confusing.

As if that wasn’t enough, the thorny devil has a false head on the back of its neck. It’s basically a big bump with two spikes sticking out of the sides. When something threatens the lizard, it ducks its head between its forelegs, which makes the bump on its neck look like a little head. But all its spines make it a painful mouthful for a predator. If something does try to swallow it, the thorny devil can puff itself up to make itself even harder to swallow, like many toads do. It does this by inflating its chest with air.

The thorny devil eats ants and only ants, specifically various species of tiny black ants found only in Australia. It has a sticky tongue to lick them up. Because it has such a specific diet, it’s hard to keep in captivity. Only a few zoos in Australia have thorny devils on display. If you listened to episode 93, where we talked about invasive ant species having an effect on entire ecosystems, the thorny devil is an example of this. Fortunately the ants it eats are doing just fine, but if an invasive ant species were introduced to the areas where it lives, the thorny devil would probably be in trouble. So no moving ants around, everyone, I mean it.

The thorny devil lives in desert and scrubland regions, and in hot weather it digs a burrow to shelter in. Females lay their eggs in burrows. To get enough water in its desert environment, the thorny devil has microscopic grooves between its scales that suck up water by capillary action. At night dew condenses on the lizard’s body, and it also collects dew by brushing against dewy vegetation or just by standing or lying on damp sand. If it does happen across water in a puddle, it will put a leg in the water and the tiny grooves in its skin suck up water and funnel it to the mouth. It’s like a living straw.

While I was researching this, I found some information on how rattlesnakes drink. When it starts to rain, a rattlesnake will coil up tightly so that rainwater collects in its coils. Then it drinks the water. This sounds like something someone just made up, but it’s real.

Let’s skip right from a snake fact to a weird turtle, because Leo also suggested the mata mata turtle as a topic. This is where I got distracted while researching, and ended up with an entire episode about giant tortoises. If you were wondering, the main difference between a turtle and a tortoise is that turtles spend most or all of their time in water, while tortoises live only on land.

The mata mata turtle lives in shallow, slow-moving water in South America, especially swamps around the Amazon and Orinoco river basins. It isn’t closely related to the snapping turtle of North America, but it does resemble a snapping turtle in some ways. Its shell is brown or black, its skin is grayish, and its plastron, or the belly section of its shell, is yellow or brown. It grows to around two feet long, or 60 cm, with a long, broad neck and wide, triangular head. Its nose comes to a point like the stem of a leaf. In fact, if you look down on a mata mata in the water, the shape of its head looks exactly like a dead leaf. It has notches and ridges on its shell, and its knobbly skin has flaps that helps camouflage the turtle among dead leaves and sticks in the water. It also has claws and webbed toes.

Unlike the snapping turtle, the mata mata is harmless to humans and most animals. It doesn’t have a sharp bill and it won’t bite. It can’t even chew its food, just swallows it whole. It eats fish, water insects, and other small animals that it captures by opening its large mouth suddenly under the water. This creates suction, sucking a lot of water and the prey right into the turtle’s mouth.

The only time the mata mata leaves the water is to lay eggs. Unlike many other turtle eggs, the mata mata eggs have hard shells, more like bird eggs. It takes the eggs about 200 days to hatch.

The mata mata spends almost all of its time motionless in the water, waiting for prey to come near, and occasionally extending its ridiculously long neck so it can take a breath from the surface. Its pointy nose is a proboscis that it breathes through. It can swim, but it usually prefers to walk along the bottom of the pond or marsh. I bet its feet squish in the mud. Squish squish squish.

Speaking of pointy-nosed reptiles, the male Pinocchio lizard has a nose that points forward and slightly upward like a rhinoceros horn. But it’s not a horn, because it’s flexible, made of cartilage. It lives in the Mindo cloud forest in Ecuador, and was only discovered by scientists in 1953, when researchers collected six specimens. And that was the last time anyone saw the Pinocchio lizard—until 2005, when some birdwatchers saw a weird lizard, took pictures and posted them online, and herpetologists started freaking out.

The Pinocchio lizard blends in so well with its environment that it’s hard to spot. It turns white when it’s asleep, which helps it look like part of a tree branch. It always perches on the end of a branch to sleep, too. During the day, it climbs verrry slowly into the treetops. It’s not a big lizard, only about three inches long, or 7.5 cm, not counting its tail, which is as long as its body. We still don’t know much about it because it’s so hard to study.

It’s not the only lizard with a horn on its nose. For instance, the rough-nosed horned lizard lives in Sri Lanka and is an ordinary-looking lizard for the most part, although it’s covered with short bristly scales that make it look like it would work well for scrubbing out dirty pots and pans. But it has a really long nose, also covered in bristly scales. Oh, and yellow or orange markings on its face that make it look like it has a big orange clown mouth. Males have longer horns than females. Male mountain horned agamas, which also live in Sri Lanka, have a single white or cream-colored horn that sticks directly forward from their nose like a tiny unicorn horn, except it’s not spiraled. In fact, it’s not a horn at all, it’s a single big pointy scale. But those lizards aren’t related to the Pinnocchio lizard.

The La Gomera giant lizard doesn’t have any horns and it’s not all that giant, less than two feet long, or around 49 cm long, including the tail. It’s black or brown on its back with a white belly. Males also have a white throat, and during mating season males inflate their throat and bob their head to attract females. It mostly eats plants, although it will eat insects too, and it lives in the Canary Islands. It’s not the most exciting lizard to look at, but it has an interesting history.

The Canary Islands are a group of islands off the coast of Morocco. It was once called the Fortunate Isles, so if you ever see that in an old book you know what islands it’s talking about. Pliny the Elder, a historian from ancient Rome, said the name Canaria came from the number of dogs on the islands. The word for dog in Latin is canis. The people of the islands were supposed to worship dogs, and some modern historians believe the old accounts of dog-headed people may be a garbled account of the Canary Islanders. Oh, and the little yellow songbirds that live on the Canary Islands took their name from the islands, not vice versa.

The islands were probably visited in ancient times by Phoenician and Greek sailors, but reportedly no one lived there when the Romans explored it in the 1st century. But when Europeans returned in the late middle ages, there were inhabitants that may have been settlers from North Africa. The islands were invaded by Europeans, who then spent centuries fighting with each other over who ruled them. It’s Spain, currently. Scientific expeditions started in the late 18th century. One of the animals the expeditions reported seeing was the La Gomera giant lizard, but it disappeared sometime after about 1900. Researchers assumed it had gone extinct.

Then a 1999 expedition from the University of La Laguna on Tenerife, one of the Canary Islands, heard stories from local residents on the island of La Gomera. They said there was a big lizard living in a few places on the island. The biologists in the expedition checked it out…and sure enough, there were giant lizards. Specifically, six of them. Just six lizards. Later they found another small group of the lizards in another area, but the total population was still no more than fifty.

Fortunately, a captive breeding program has been successful and today there are around 250 of the lizards in the wild, living only on two hard to reach cliffs. They’re vulnerable to introduced predators, especially cats, which eat the eggs and young lizards. Another 300 or so live in a recovery center where they’re protected from predators before being released into the wild. So basically, the La Gomera giant lizard isn’t so much strange as just very, very lucky.

Another lizard that is definitely strange is the frilled lizard from northern Australia and southern New Guinea. It’s bigger than the La Gomera giant lizard, almost three feet long, or 85 cm, and eats insects, spiders, and small animals. It lives in trees and is well camouflaged with blotches and spots on a gray or brown background to help camouflage it among branches and against bark.

The frilled lizard gets its name from the frill on eitherside of its head. Most of the time it keeps the frill folded back against itsneck. When it’s threatened, though, it spreads the frill out and opens itsmouth wide. The inside of its mouth is bright yellow or pink, and the frill hasbright red or yellow scales that don’t show when it’s folded. It’s the lizardequivalent of a jump scare in scary movies. Regular lizard, regular lizard…BWAMP BIG SCARY BRIGHT LIZARD

The frill is made up of spines of cartilage that grow from the lizard’s jaw bones, with skin connecting the spines. It’s not small, either. When expanded, it can be almost a foot across, or 25 cm.

The frilled lizard isn’t dangerous, though, and if its threat display doesn’t scare off a predator, it runs away until it finds a tree to climb. It runs so fast, in fact, that it lifts its body up and just runs on its hind legs, which helps it navigate uneven ground and gives it a better view of what’s around it. It also holds its long tail out as a counterweight to keep its body upright.

That’s supposed to be all the strange details about the frilled lizard…but there are sightings of it doing something unexpected on rare occasions. People occasionally report seeing a frilled lizard fall or jump from a tree, and glide down using its frill as a parachute. There’s no proof that this actually happens, but it sounds plausible.

Another Australian lizard called the shingleback, or bobtail, looks kind of like a pinecone with legs. Or a poop with legs, just going to set that down and walk away. It’s brown with darker and lighter speckles or yellow splotches, large overlapping scales, a stubby thick tail, and a broad head. In fact, its head and tail look a lot alike, which confuses predators. It also stores fat in its tail for winter. It grows about a foot long, or 30 cm, and eats snails, insects, flowers, and other small animals and plants. It lives in arid and desert areas, and their tough skin and overlapping scales help reduce water loss. Its eyes are tiny, like little black beads.

The shingleback looks nothing like the frilled lizard, but it has one thing in common with it. When threatened, the shingleback will open its mouth wide and stick out its large, dark blue tongue. It is an impressively blue, impressively big tongue, and the inside of the shingleback’s mouth is otherwise pale, so it’s startling, to say the least.

The shingleback mates for life. Most of the year the shingleback is solitary, but in spring mated pairs find each other again and go around together while they hunt for food. The female gives birth to two live babies instead of laying eggs.

I could go on and on and on about all the weird reptiles in the world. There are just so many! We’ll definitely come back to this topic in the future, but for now, let’s finish up with a snake called Iwasaki’s snail-eater.

The snail-eater lives on a few small islands southwest of Japan’s main islands. It’s small, only about 7 inches long, or 22 cm, and is orangey in color with darker markings and bright orange eyes. And it only eats one thing: snails.

It’s so perfectly adapted to its diet of snails that its jaw is asymmetrical so it can more easily wedge it into the typical snail’s shell, which coils clockwise. If you remember from the little yard animals episode, some snails very rarely coil the opposite way, and the snail-eater snake is so specialized to eat ordinary snails that it has trouble with counter-clockwise coiled snail shells. It has more teeth on its right mandible. There are other snail-eater snakes closely related to Iwasaki’s snail-eater that have this same adaptation, and in some areas where the snakes are numerous, counter-clockwise snails are much more common than in areas without a lot of snail-eater snakes.

So that’s a reminder that whether you’re a little snail-eating snake or a regular human being, the things you do have an effect on the world around you, even if it’s in ways too small for you to notice without looking very closely.

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. We also have a Patreon if you’d like to support us that way.

Thanks for listening!

Episode 095: Giant Tortoises

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This week let’s learn about giant tortoises! What’s the difference between a turtle and a tortoise? The most basic difference is that the turtle lives in water and the tortoise lives on land. And there are some really, really big tortoises in the world!

A Galapagos tortoise:

Show transcript:

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

This episode was supposed to be about strange reptiles, with more awesome suggestions from listeners. I was going to include some information about a couple of giant tortoises…but the more I researched, the longer that part of the episode became, until it just took over. So here’s an episode about giant tortoises, and we’ll have the strange reptiles episode in a couple of weeks instead. I’m going to give a shout-out to listeners Leo and Finn, who have been waiting patiently to hear their suggestions. Sorry you’ll have to wait a little bit longer.

The biggest tortoise in the world is the Galapagos Tortoise, which as you probably know, or can guess from the name, lives in the Galapagos Islands off the coast of Ecuador. In fact, the islands were named after the tortoises. Galapago means tortoise in Old Spanish. There are eleven species of Galapagos tortoise alive today, but there used to be 15. The others were mostly eaten to extinction by sailors who would stop by the Galapagos Islands, capture tortoises, and sail away with them to eat later.

The biggest individual Galapagos tortoise ever measured was a male named Goliath. When he died in 2002, Goliath was 4.5 feet long, or 1.36 meters, 2 feet three inches high, or 68.5 cm, and weighed 919 pounds, or 417 kg. He was only 42 years old when he died, but Galapagos tortoises frequently live for more than 150 years. Adult tortoises have no predators except humans. They’re just too big, too heavy, too strong, and have too tough a shell for other predators to bother with.

The Galapagos tortoise eats plants, including grass, leaves, fruit, and even cacti. Its neck is long, which allows it to reach plants that are farther away, since it can’t exactly climb trees. It can survive up to six months without water, getting most of its moisture from the plants it eats, but some tortoises on more arid islands will lick dew from rocks to get moisture. Some of the boulders have been licked by tortoises so much over the centuries that they have deep grooves worn in the surface from turtle tongues.

As I’ve mentioned before in other episodes, sometimes herbivores will eat meat when they can get it. The Galapagos tortoise does this too on occasion. There’s a type of finch on the Galapagos that cleans parasites off the tortoises, and to help the finch reach as much of its skin as possible, the tortoise will stand up straight with its legs extended. The finches hop underneath and clean ticks and other parasites from the tortoise’s legs, neck, and the skin between the carapace, or upper shell, and the plastron, the lower shell. But occasionally a tortoise will suddenly pull its legs into its shell and drop, smashing the finches flat. Then it stands up and eats the squashed birds. This is not cool, tortoise. Those birds are trying to help you.

Galapagos tortoises lay round, hard-shelled eggs. The female digs a hole in the dirt that’s about a foot deep, or 30 cm, and lays about a dozen eggs in it. She covers the eggs with dirt, tamps it down with her plastron, and leaves. When the babies hatch, they have to dig their way out of the hole. This can take weeks, but fortunately the babies still have yolk sacs attached that keep them from starving.

One of the Galapagos tortoise species that went extinct recently was the Pinta Island tortoise. The last known individual was called Lonesome George. He was found in 1971 on Pinta Island and taken to the Charles Darwin Research Station on Santa Cruz Island. Although researchers tried to find more Pinta Island tortoises, even offering $10,000 if someone found a female, George turned out to be the very last one. He lived with two females of another Galapagos giant tortoise species, in hopes that they were closely related enough to produce babies, but none of the eggs the females laid ever hatched. Lonesome George died in 2012.

Since then, in 2015, DNA testing on a population of tortoises living on Santa Cruz Island showed that they are a subspecies of their own, and closely related to the Pinta Island tortoises. This had to be an “if only we’d known” moment for the conservationists, who could have paired George with females from that population to produce offspring that were genetically close to the Pinta Island tortoise.

Other Galapagos tortoise species were luckier. The Española Island tortoise was down to only 14 individuals in the wild in 1963. They were all taken to the research station on Santa Cruz Island, joined a few years later by another Española tortoise that had been living in the San Diego Zoo. The breeding program was successful and these days there are over a thousand Española tortoises on the island. Similarly, rats introduced to Pinzón Island in the late 19th century nearly drove that island’s species of tortoise to extinction by eating their eggs and hatchlings. By 1965 there were fewer than 200 adults left alive, and no babies had survived for the better part of a century. Scientists started collecting eggs to incubate in safety at the research station, and rear in captivity until they were big enough to survive rat attacks. By 2012, all the rats had been removed from the island and tortoise nests started to hatch naturally in the wild again.

But the Galapagos tortoise isn’t the only giant tortoise alive. The Aldabra giant tortoise is from the Aldabra Atoll in the Seychelles [pronounced say-SHELZ], a collection of 115 islands off the coast of East Africa. It’s about the same size as the Galapagos tortoise and looks similar, but it’s not closely related. Females lay leathery-shelled eggs in shallow nests. In hot weather, some Aldabra giant tortoises will dig burrows to shelter from the heat. It eats plants and has a long neck like the Galapagos tortoise to reach branches, but unlike the Galapagos tortoise it will sometimes rear up on its hind legs to reach leaves. This is dangerous for a tortoise, because if it topples over on its back, it might not be able to right itself and can die.

Like the Galapagos tortoise, some species of Aldabra giant tortoise have gone extinct in the recent past, and for the same reasons. This included Arnold’s giant tortoise, which lived on one of the central Seychelles islands.

In 1995, the Nature Protection Trust of Seychelles was told about two unusual tortoises in a hotel garden. A couple of scientists went to investigate. The tortoises were both male, extremely old, and appeared to fit the description of Arnold’s giant tortoise, which had supposedly gone extinct over a hundred years before. Where had they come from?

It turns out that the hotel had recently bought the tortoises from a very old local man. They had been in the man’s family for longer than anyone alive could remember. Originally there had been three tortoises, but one had died only a matter of months before the scientists discovered them. They were able to get the dead tortoise’s skeleton for study, which proved that these weren’t just regular old Aldabra giant tortoises, they were Arnold’s giant tortoises—possibly the last two alive in the world.

But the researchers weren’t going to give up that easily. They started digging into reports of other unusual tortoises on the islands. Not only did they eventually find a handful of other Arnold’s giant tortoises, they found a second subspecies that had supposedly gone extinct in 1840, referred to as hololissa after its scientific name, Aldabrachelys hololissa.

As if that wasn’t awesome enough, after all this excitement in the tortoise studying community, the Blackpool Zoo in England took a closer look at the Aldabra giant tortoise that had been living there for the last 25 years, named Darwin. It turns out that Darwin was a hololissa tortoise all along. After that, other zoos brought in experts to examine their giant tortoises, and more hololissa and Arnold’s individuals turned up. The problem is that these tortoises all look pretty much alike except to experts. The tortoises have been placed in a successful captive breeding program in the Seychelles.

Researchers used to think that giant tortoises grew so big due to island gigantism, where a species isolated on an island evolves to become larger. In addition to the Seychelles and the Galapagos, giant tortoises used to live on the Canary Islands and the Mascarene islands, including on Mauritius. You know, where the dodo used to live.

But giant tortoises used to be common all over the world, not just on islands where they mostly live today. Big as these living tortoises are, there used to be giant tortoises even bigger.

The biggest known giant tortoise lived in what is now India and Pakistan, and probably in other places too. It lived around two million years ago and may have only gone extinct about 100,000 years ago, or maybe even more recently. It was twice the size of the Galapagos tortoise, possibly as much as nine feet long, or 2.7 meters, and six feet high, or 1.8 meters.

The giant land tortoise, Hesperotestudo crassiscutata, lived even more recently in North and Central America. It was a little bit larger than the Galapagos tortoise, maybe six feet long, or 1.8 meters, but it went extinct only 12,000 years ago. Researchers think humans may have played a part in driving that tortoise to extinction too, by eating it and its eggs. Since I’m recording this episode on Thanksgiving day in the United States, I’m feeling a little guilty about eating so much turkey. Fortunately, turkeys, unlike giant tortoises, are not endangered.

I’m thankful that some species of giant tortoises have survived until today. They’re awesome animals.

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 094: The Koala and the Monato del Monte

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Thanks for this week’s topic suggestion from Jideobi! This week we’re going to learn all about koalas and some of their strange friends!

The Blood on the Rocks podcast (not for kids) where you can hear a segment by me in the WWI megasode!

An unlocked Patreon episode about wombats

So cuddly, little koala:

I am dying of cute y’all:

I have actually died. I am ded because this mama koala is feeding her baby a leaf:

I came back to life but then I died again because of this monito del monte:

Show transcript:

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

It’s another listener suggestion week! But before we get started, a quick shout-out to the podcast Blood on the Rocks. I was one of about a dozen podcasters who participated in their recent epic World War I megasode. It’s not a podcast for kids since it covers dark topics like true crime and the more gruesome bits of history, but if you are a grown-up type person who finds that sort of thing interesting, I’ll put a link in the show notes so you can check it out. My part of the show was a short segment about the animals of WWI. I also released a different version of the segment as a patreon bonus episode earlier this month.

Anyway, let’s start off this week’s episode about koalas. Thanks to Jideobi, who suggested we learn about the koala. I can’t believe I haven’t covered koalas on the podcast before. They’re such amazing, weird animals.

Many people call the koala a koala bear, but it’s not related to bears. The koala is a marsupial—you know, where the babies stay in their mama’s pouch. It’s most closely related to the wombat, and I was going to talk about the wombat in this episode until I remembered I had a whole Patreon episode about the wombat. I’ve unlocked it so anyone can listen to it. There’s a link in the show notes and you can click on it and listen in your browser, no login needed.

The koala lives near the coasts of eastern and southern Australia in eucalyptus trees. It’s gray, gray-brown, or brown in color, with no tail, short floofy ears, a flat face with a big black nose, and long claws that help it cling to tree trunks. You may already know all this about the koala, and you probably know that almost all it eats is the leaves of the eucalyptus tree. But there is so much more to learn about the koala.

For one thing, its diet. Eucalyptus trees are mostly native to Australia, although people in other parts of the world grow them as ornamentals, although they need warm climates to survive. Koalas eat the leaves of many different types of eucalyptus trees, but they prefer about 30 species, typically ones whose leaves contain higher levels of protein. But eucalyptus leaves contain toxins that make other animals avoid them—toxins that can poison even large animals like horses and cattle if they eat any. Even handling eucalyptus leaves with your bare hands can irritate your skin.

The koala’s liver produces a type of protein called cytochrome P450, which breaks down the toxins and stops them from making the koala sick. Still, researchers have observed that the koala does avoid certain leaves or parts of leaves that contain higher concentrations of the toxins.

Researchers recently sequenced the koala genome, which gives us new genetic understanding of its biology. One thing the genome reveals is the koala genes associated with taste receptors. For most mammals, a bitter taste is a warning that something you’re eating might be toxic. That’s why things like coffee and strong tea are acquired tastes, because they contain compounds that can make the drink taste bitter, especially if it’s not prepared properly. That’s why I put a whole bunch of sugar and milk into my coffee. The koala has more bitter taste receptors than almost any other animal studied, which means it can probably taste the level of toxins in every leaf. This helps it choose the least toxic leaves. Interestingly, the koala also has taste receptors for sweetness and for umami, which is the flavor mostly associated with meat. So it’s likely that the ancestors of the koala had a broad diet that probably included fruit and meat.

Because eucalyptus leaves aren’t all that high in protein, the koala has a low metabolic rate and spends a lot of its time asleep. It sleeps as much as eighteen to twenty hours a day, curled up in the fork of a tree. That sounds so nice. It’s mostly active at night. It spends almost all its time in trees, but when it wants to move to a different tree, it just climbs down and walks to a tree it likes better. Sometimes the leaves it eats don’t give it quite enough moisture, so it will climb down from its tree to drink from a stream.

The koala eats a lot of leaves, something like two and a half pounds of them a day, or almost 1.2 kilograms, and it even has cheek pouches where it can store leaves to eat later. Its digestive system is really long, which helps it extract as many nutrients from its food as possible.

If you’re not from Australia, you may not know that eucalyptus leaves have a pungent smell. The leaves contain eucalyptus oil, which has a number of health benefits for humans if used properly in things like cough drops, ointments, or mouthwashes. And since the koala eats eucalyptus leaves all day every day, guess what it smells like. That’s right. The koala smells like a cough drop.

Naturally, a koala needs access to a lot of trees in order to get enough to eat, about 100 trees per koala. These days it’s threatened by habitat loss as forests in Australia are chopped down to build houses or create farmland. Another threat to the koala is being hit by cars while wandering around looking for a new tree to climb. Recently, the Queensland Dept of Transport and Main Roads started building special tunnels under roads and ledges across roads designed specifically to allow koalas to cross safely. A tracking study to see if koalas are using the new structures show that yes, they are. In fact, even though the koala has a small brain in comparison to its body size, it’s a pretty smart animal in some ways. It started using the tunnels and ledges as soon as they were installed.

Another threat to the koala is a bacterial disease called koala chlamydia. It can cause blindness, pneumonia, and infections that stop koalas from being able to have babies. A newly developed vaccine for the disease has proven effective, but the problem is getting the vaccine to wild animals that live way up in trees. Currently, anytime someone brings an injured koala to a zoo hospital, veterinarians make sure to vaccinate it while it’s being treated for its injuries.

The koala has weird feet that look and act a lot like primate hands. It has five digits on its forefeet, three fingers and what are basically two thumbs—two opposable digits that help it grasp tree limbs more securely. Its hind feet have four toes, two regular toes, one opposable thumb toe with no claw, and one toe that is made up of two toes that are fused together, although it still has two claws at the end. It mainly uses the fused toes to groom its fur. It also has friction ridges on its toe pads, otherwise known as fingerprints, that are unique to each individual like those of humans and other primates.

Even the koala’s butt is kind of weird. It has a pad made of cartilage at the end of its spine that gives it a built-in chair for sitting in branches.

The koala has a good sense of smell, excellent hearing, and poor vision. Its eyes are small and have slit pupils like a cat’s. Male koalas mark their trees with scent from a gland on the chest, which is bare of fur.

From pictures, koalas look pretty small, maybe a little larger than a rabbit, but it’s actually closer to the size of a dog. It’s two to three feet long, or around 60 to 90 cm, with males larger than females. It also looks really cuddly, but it can be dangerous because its claws are so long and sharp. The koala just wants to be left alone to sleep and eat leaves.

There used to be an even bigger species of koala, which went extinct around 50,000 years ago. It’s called the giant koala, but it actually wasn’t all that much bigger than the koalas alive today, maybe twice its size at the most. It probably looked and acted like modern koalas, it lived in the same places as modern koalas, and it lived at the same time as modern koalas, which have been around for close to a million years. When researchers found this out, they were really surprised because they had assumed modern koalas were smaller descendants of the giant koala. We’re still not sure why the giant koala went extinct while the modern koala is still around.

We don’t know a lot about the koala’s ancestors, for that matter. Koala fossils are rare. So let’s talk for a moment about when marsupials in general developed. An extinct marsupial called the djarthia lived in Australia about 55 million years ago, and although it was only about the size of a mouse, researchers think its descendants spread out across Australia and evolved into everything from kangaroos and koalas to thylacines and Tasmanian devils. Djarthia’s ancestors probably came from South America. But how did they get from South America all the way to Australia?

More than a hundred million years ago, the supercontinent of Gondwana included land masses that later broke up and became what we know as South America, Australia, and Antarctica, as well as Africa and India. Antarctica was in the middle of Gondwana. The oldest known marsupial appears in North America about 65 million years ago, which was part of the other supercontinent on Earth at the same time as Gondwana, called Laurasia. You can easily see how the continents today fit together like puzzle pieces if you look at a map, especially how eastern South America snugs right up against western Africa. But about the time marsupials were spreading out across Laurasia, from North America all the way to China, Laurasia and Gondwana were connected for a while along the northern edge of South America. Animals were able to cross from Laurasia to Gondwana before the two supercontinents split apart again. Marsupials spread from Laurasia and across Gondwana before the continent of Australia separated about 50 million years ago. And little djarthia survived and thrived in Australia while marsupials in other parts of the world were not doing nearly as well. In fact, marsupials did so well in Australia that researchers think that before Australia was fully separated from Gondwana, marsupials actually started spreading back out of Australia and into Gondwana again. There’s even a living marsupial in South America now called the Monito del Monte that is more closely related to the marsupials in Australia than it is to the other marsupials living in South America.

In fact, let’s talk about the monito del monte for a minute, because it’s so cute my brain might just explode if I don’t tell you about it. Its name means ‘little monkey of the mountain,’ but it’s not a monkey, of course. It only lives in trees in the Andean forests of western Argentina and Chile, and it looks like a rodent at first glance. It’s not a rodent either. It’s brown with a pale belly and little pink feet. It grows to about five inches long at most, or 13 cm, not counting its long tail, which doubles its length. Its tail is furry except for a bare patch underneath, which probably helps it get a better grip on branches as it climbs through the treetops. Its tail is prehensile, at least to some degree. The monito del monte stores fat at the base of the tail for winter, when it retreats to its tree nest of leaves lined with soft moss and hibernates. The female has a fur-lined pouch with four teats. It mostly eats insects along with fruit that grows in the very top of the tree canopy, and as a result it helps spread the seeds of plants like orchids and bromeliads.

We’ve gotten away from koalas, so here’s something else interesting about the koala. Males bellow to attract mates, a sound that is much deeper in pitch than it should be for an animal its size. Researchers have discovered that the koala has an extra pair of vocal folds outside of the larynx. No other mammal is known to have anything like this except for toothed whales, which have special structures outside of the larynx that allow them to generate clicks for echolocation. Female koalas bellow too, but not as loudly as males, and babies, called joeys, squeak.

The koala’s mating call sounds like this. This is seriously the funniest thing I’ve heard in weeks, so even though it’s long, I’m going to play the whole thing. Enjoy!

[koala mating call]

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 092: Marine Reptiles

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This week we return to the sea to learn about some marine reptiles, both living and extinct!

A marine iguana, eatin:

Another marine iguana, swimmin:

Maybe Darwin was right about the marine iguana looking like imps of darkness:

A mosasaurus skeleton:

A plesiosaur skeleton:

Thalattosaurs:

Show transcript:

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

It’s been a while since we had an episode about the ocean, and I thought it would be interesting to learn about reptiles that evolved to live in a marine environment. Some marine reptiles we’ve already covered in previous episodes, including saltwater crocodiles, sea turtles, and sea snakes. But we haven’t talked much about extinct marine reptiles, and I don’t think we’ve ever had an episode about the marine iguana.

The marine iguana is only found on the Galapagos Islands. It eats seaweed and algae that grow in shallow water around the islands, so it swims and dives to find its food. It’s a large, strong iguana that can grow up to five feet long, or 1.5 meters, with short legs, a short snout, and a row of spines along its back. It’s black or gray in color, which absorbs heat from the sun and keeps the iguana warmer. Many have colorful markings, especially males during the breeding season. The markings might be red or pink, blue-green, yellow, or off-white, depending on subspecies. Some researchers think the kinds of algae eaten by the various subspecies of marine iguana also contributes to the colors of their markings. Males are larger than females.

The marine iguana is well adapted to swimming, although it’s not a fast swimmer. It uses its flattened tail and partially webbed toes to propel itself through the water, and the spines on its back keep it stable in the water. It has long claws that it uses to hold onto rocks to keep from being swept away. Newly hatched babies can swim immediately, but they stay out of the water whenever possible until they’re at least a year or two old. The water around the islands is cold, so the marine iguana will forage in the water for a short time, then come back on land to bask in the sun and warm up.

Only the biggest marine iguanas, mostly adult males, will dive for their food. Females and smaller males usually stay in shallow water, especially at low tide when the algae is easier to reach. A marine iguana can dive up to almost 100 feet, or 30 meters, and stay underwater for half an hour. During bad weather, the iguanas stay on shore, often gathered together to conserve body heat.

Researchers used to think the marine iguana evolved from land iguanas that were swept from Central or South America by storms and floated to the Galapagos islands on rafts of vegetation. Then genetic studies showed that the marine iguana started evolving separately from land iguanas around 8 to 10 million years ago. The Galapagos islands are of varying ages, formed by volcanic activity, but the oldest is only about 3.2 million years old. So obviously the two groups of iguana were separated long before the Galapagos formed. Researchers then speculated that there may have been other, older islands in the Galapagos or nearby that are now submerged, which were where the marine iguanas first started to evolve separately from land iguanas. Then new genetic studies indicated that marine and land iguanas actually separated about 4.5 million years ago, which is not that much of a difference from the oldest islands of the Galapagos, so researchers are back to the original hypothesis. As I’ve said before, science isn’t wrong or right, scientists learn new things and adapt their theories to account for the new information.

For instance, at the moment researchers aren’t sure how marine iguanas shrink during years when weather conditions keep them from finding as much food as they need. I don’t mean they lose weight, I mean they actually shrink. Results of a study published in the journal Nature say marine iguanas shrank up to 2.7 inches, or 6.8 cm, during years with El Nino weather patterns, which brings stormy weather. The iguanas’ bones actually shrunk, making them both shorter and smaller. Not only that, after weather patterns returned to normal and the iguanas were able to find more and better food, the shrinking reversed and they grew larger again. Shrinking reduces the iguanas’ dietary requirements, making them able to survive on less food without long-term health issues.

Because the marine iguana eats algae and other plants that grow in the ocean, it ingests a lot of salt. It has a special gland on the nose that filters excess salt from the blood, which the iguana then expels by sneezing. Many times marine iguanas look like they have white markings on the head, but in actuality it’s just dried salt that they’ve sneezed out.

Like most of the animals that live on the Galapagos Islands, the marine iguana is found nowhere else in the world. It would have been easy for early visitors to the islands to have eaten them to extinction the way they did so many other species. But sailors considered marine iguanas so ugly that they refused to eat them. Even Charles Darwin called them disgusting imps of darkness. That’s harsh, especially since I think they’re cute, but it kept them safe until people understood the need for conservation.

Many marine reptiles are extinct, including the ichthyosaurs we talked about in episode 63. These days the top predators in the ocean are sharks and whales, but mosasaurs and plesiosaurs used to fill those ecological niches.

Mosasaurs looked a lot like sharks in some ways, and like whales in other ways, but they were reptiles. There were a lot of them, from one barely more than three feet long, or 1 meter, up to some species that grew some 50 feet long or more, or up to 17 meters.

All species of mosasaur had four flippers, long powerful tails, and small heads with short necks. Its skull resembled a snake’s in that it was flexible, allowing the mosasaur to swallow prey larger than its head. It also had double-hinged jaws that could open extremely wide. It’s also possible that the mosasaur had a forked tongue. We have skin impressions of mosasaurs, so we know at least some species had finely scaled skins like snakes. Some species had fluked tails shaped like a shark’s tail. The mosasaur used its tail to propel itself through the water, with its flippers only helping it maneuver. Some researchers think the closest living relative of the mosasaur is the Komodo dragon and other monitor lizards, but others think the mosasaur was more closely related to snakes.

The mosasaur came to the surface to breathe every so often like other marine reptiles. It also gave birth to live young. It probably swallowed its prey whole, although some species had specialized teeth that allowed them to crush mollusk shells, such as ammonites. Some studies suggest the mosasaur may even have been warm-blooded. It went extinct at the same time as the dinosaurs.

The plesiosaur looks similar to the mosasaur in many ways, including overall shape and size, but was probably more closely related to turtles than to the mosasaur. Most plesiosaurs had a broad body, a very long neck and small head, and a fairly short tail. It propelled itself with its four long flippers like sea turtles do and was probably relatively slow. Some plesiosaurs, known as pliosaurs, had shorter necks and much larger heads, and swam much faster.

Like the mosasaur, the plesiosaur may have been warm-blooded, and gave birth to live babies instead of laying eggs. The longest plesiosaur was called elasmosaur, which had an extremely long neck. Some elasmosaur species had as many as 76 neck vertebrae. This is your reminder that almost all mammals have seven neck vertebrae. While the elasmosaur could grow up to 50 feet long, or 15 meters, much of its length was neck. Researchers used to think plesiosaur necks were flexible like a goose or swan’s neck, but new findings indicate that it was probably fairly stiff and could mostly just move side to side. Skin impressions show slightly wrinkled skin and some species may have had a tail fluke.

Long-necked plesiosaurs had large eyes and probably hunted by sight. Researchers hypothesize that the long neck might have allowed it to sneak up on fish before they could sense the movement of water from the plesiosaur’s approaching body.

At least one elasmosaur was a filter feeder, with interlocking teeth that it used to filter small prey from either the water or sand, or possibly both. It shows many similarities in skull shape to early baleen whales, too. Researchers think it had a valve at the base of the nostrils that closed them while the animal was feeding, since plesiosaurs and some other marine reptiles have nostrils that open into the mouth.

Like mosasaurs, plesiosaurs died out at the same time as the dinosaurs. They did not live on as the Loch Ness Monster, okay?

While mosasaurs and plesiosaurs lived throughout the world’s oceans, the various species of thalattosaur lived around what is now North America, western Europe, and parts of China. They lived during the mid-Triassic period, up to about 250 million years ago, and we don’t know a whole lot about them because we don’t have all that many fossils. We’re not even really sure where they fit in the reptile family tree.

The thalattosaur hunted in warm, shallow water but otherwise probably lived on land. It resembled a lizard, but with some interesting adaptations to the water. It had four short legs, probably had webbed toes, its body was slender and flexible, and its long tail widened at the end to form a paddle. Some species grew up to 13 feet long, or 4 meters. Some species had nostrils near the eyes, some had snouts that point downward, some had snouts that point upward. Some probably ate jellyfish and other soft foods, others probably ate fish, and a few had teeth that could crush mollusk shells—and had teeth on the roof of its mouth.

This actually isn’t unusual in reptiles and some amphibians. Most snakes have a double row of teeth in the upper jaw, one row growing from the jaw like normal, the other row growing from the roof of the mouth. Some lizards have small teeth that grow from the roof of the mouth, as do many frogs. These help the animal grasp its prey and keep it from escaping while it’s being swallowed whole. This is pretty neat, but it’s not as neat as shrinking iguanas. Nothing beats that.

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 090: Spiders! NO COME BACK, IT’S SAFE TO LISTEN

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As we get closer and closer to Halloween, the monsters get scarier and scarier! Okay, spiders are not technically monsters, but some people think they are. Don’t worry, I keep descriptions to a minimum so arachnophobes should be okay! This week we learn about some spider friends and some spider mysteries.

I stole the above cartoon from here. I am sorry, Science World.

A cape made from golden silk orbweaver silk:

Further reading and listening:

Blue spiders

Varmints! Podcast scorpions episode

Show transcript:

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

It’s almost Halloween! I’m on the third bag of gummi spiders, although they’ve changed the flavor from last year so I only eat the orange and yellow ones. The purple and green ones are in the bucket to give out to unsuspecting children.

Speaking of spiders…yes, I’m going there. I realize a lot of people are scared of spiders, but they’re beautiful, fascinating animals that are associated with Halloween. Don’t worry, I will try hard not to say anything that will set off anyone’s arachnophobia. Besides, there are some mysterious spiders out there that I think you’ll find really interesting.

First off, you don’t have to worry about gigantic spiders like in the movies. Spiders have an exoskeleton like other arthropods, and if a spider got too big, some researchers think its exoskeleton would weigh so much the spider wouldn’t be able to move. Not only that, spiders have a respiratory system that isn’t nearly as efficient as that of most vertebrates, so giant spiders couldn’t exist because they wouldn’t be able to get enough oxygen to function.

Specifically, some spiders have a tracheal system of breathing, like most insects and other arthropods also have. These are breathing tubes that allow air to pass through the exoskeleton and into the body, but it’s a passive process and spiders don’t actually breathe in and out. Other spiders have what are called book lungs. The book lung is made up of a stack of soft plates sort of like the pages of a book. Oxygen passes through the plates and is absorbed into the blood, which by the way is pale blue. This is also a passive process.

In other words, that picture that’s forever popping up on facebook of the enormous spider on the side of someone’s house, it’s photoshopped. In fact, pretty much any photo you see of a gigantic spider or insect or other arthropod is either photoshopped or made to look bigger by forced perspective. Also, spiders with wings are photoshopped, because no spider has ever had wings, even fossil spiders all the way back to the dawn of spider history, over 300 million years ago. So that’s one less thing to worry about.

Spiders live all over the world, everywhere except in the ocean and in Antarctica. The smallest spider known is .37 mm, so basically microscopic. It lives in Colombia and basically lives out its whole life not knowing most things about the world, like what whales are and how to operate a smart phone. On the other hand, the largest spider in the world is a tarantula called the goliath birdeater, and it probably also doesn’t know what whales are and how to use a smartphone. The goliath birdeater is the heaviest spider at a bit over 6 ounces, or 175 g, and has a legspan of 11inches, or 28 cm. Despite its name, it mostly eats insects but it will occasionally eat frogs, small rodents, small snakes, and worms. It lives in swampy areas in the rainforests of northeastern South America.

The spider with the biggest legspan—yes, I know, some of you are freaking out but I can’t do an episode about spiders and not talk about the biggest spiders. The spider with the biggest legspan is the giant huntsman, which lives around cave entrances in Laos, a country in southeast Asia. And it’s not much bigger than the goliath birdeater, with a legspan of one foot, or 30 cm.

All spiders produce silk but not all of them make webs. I won’t go into the process of how a spider generates silk, because it’s complicated and I just read about it and have already forgotten all the details, but spiders use silk to wrap up their eggs safely, line the walls of burrows to make a comfortable home, wrap up prey so it can’t escape, and of course make webs and get around without falling off tall things.

Most spider silk appears white, but the golden silk orb-weaver produces golden silk. The spider itself is gorgeous, with striped legs and a body that can be yellow, red, greenish, or brown, often with white spots and delicate patterns. It lives all over the world in warm climates, especially Australia. It builds webs that can be several feet across, or over a meter, and it occasionally catches and eats small birds as well as insects. One was even spotted eating a small snake that had been caught in its web. Its silk has occasionally been used to make cloth, but spider silk is difficult to collect in the quantities needed for textiles.

Most spiders eat insects, although one spider eats plants. Just one. It lives in Central America. Some baby spiders eat nectar until they get big enough to catch prey. Some spiders will scavenge on dead insects, some will eat fruit as well as insects, many eat pollen that gets caught on their webs, and some eat each other. Some spiders are adapted to swim in freshwater, and while they mostly eat aquatic insects, they will catch and eat small fish. Some spiders also catch and eat small birds and bats.

Basically, there are too many spiders to cover everything about them in one episode. Besides, what we all really want to know about are the mystery spiders. Because it’s almost Halloween!

Our first mystery spider is from Africa, specifically the jungles of central Africa. In 1938, an English couple, Reginald and Margurite Lloyd, were driving through the jungle when what looked like a monkey or cat stepped onto the dirt road. They stopped the car so it could cross the road, at which point they saw it was a spider. It looked like a tarantula but was huge, with a legspan of up to three feet, or almost a meter. Before Reginald Lloyd could grab his camera, the spider disappeared into the undergrowth.

Supposedly, the same giant spider was reported in the 1890s by a British missionary named Arthur John Simes. Some of his men got tangled in a huge web and a pair of spiders came out and attacked them. The larger of the spiders, presumably the female, was four feet across, or 1.2 meters. Simes was bitten but shot one of the spiders and was able to escape. He ultimately died of the bite.

This seems less than believable, to put it gently. The largest spider that catches prey with a web is our friend the golden silk orbweaver, but its legspan is only five inches across, or 12 cm. The biggest spiders in the world are tarantulas and other spiders that hunt actively, none of which build webs.

A more believable giant-spider mystery is called the up-island spider, which is supposed to be an extra-large variety of wolf spider from parts of Maine in the United States. Its legspan is supposed to be as much as 8 inches across, or 20 cm. Wolf spiders are common throughout the world, and while they look scary, they bite people very rarely and their venom is weak, no worse than a bee sting. The wolf spider with the biggest legspan is Hogna ingens, with a legspan less than 5 inches, or 12 cm. Hogna ingens lives on one island in the Maderia archipelago, and is a beautiful soft grey with white stripes on the legs. It’s critically endangered, but Bristol Zoo in England has a successful captive breeding program underway so it won’t go extinct. The species of wolf spider most commonly found in Maine is probably Tigrosa helluo, but it’s not very big, only a couple of inches across at most, or maybe five cm. It’s likely that the up-island spider is actually the Carolina wolf spider, which can have a legspan of four inches, or 10 cm, but I can tell you from personal experience that they look a whole lot bigger if you see one in your garage or basement when you flip on the light. The Carolina wolf spider does live in Maine, but it’s not very common in the area.

Zoologist Karl Shuker has a blog post from 2010, with some later updates, about spiders that are normal sized except for being blue, in species that aren’t normally blue. It’s an interesting post and I’ll link to it in the show notes if you want to read it and look at the pictures he posts. He discusses a number of blue spiders readers have reported to him, and while one seems to have been spraypainted blue, the rest appear naturally colored blue.

As it happens, there are lots of reports of blue spiders out there—and other blue invertebrates like woodlice. According Shuker’s post, some of these have been studied and found to be suffering from a virus called invertebrate iridovirus, or IIV. This infects invertebrates and sometimes is so highly concentrated in the animal’s tissues that it forms crystalline aggregations that emit blue iridescence and make the animal look blue. I should stress that you can’t catch IIV if you are a mammal, bird, reptile, fish, or anything else with a backbone, which I am assuming is most of my listeners.

The ancestors of spiders evolved around 380 million years ago, although those animals probably couldn’t generate silk. They did have eight legs, though. True spiders date to around 300 million years ago. Those spiders had silk spinnerets in the middle of the abdomen instead of at the end, and modern spiders appeared around 250 million years ago. We have fossil spiders and we also have spiders preserved in amber, the resin of certain trees that later fossilizes but remains at least partly transparent. We even have a spider web preserved in amber and dated to 110 million years ago, along with several insects that had been trapped in the web.

Spiders are closely related to whip scorpions, also called whip spiders because they look superficially similar to spiders in some ways except that they are HORRIFYING and I cannot look at pictures of them right now, I just can’t. While whip scorpions have eight legs, they only walk on six of them. The front pair are more like feelers and are elongated. Other whip scorpions have long, thin tails and are sometimes called vinegaroons, because if they’re disturbed they squirt a liquid that smells like vinegar. Some whip scorpions look a lot like scorpions. I don’t want to talk about scorpions. In fact, I’m just going to stop talking entirely, because while spiders don’t bother me, scorpions do and I cannot look at these pictures anymore, okay? If you want to learn about scorpions, Varmints! Podcast just released a scorpions episode. I’ll put a link in the show notes. Eventually I’ll manage to listen to it myself.

Happy Halloween?

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 083: Lions, tigers, and other big cats…of mystery!

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I’ve been meaning to do a big cat episode for a while, thanks to listener Damian who suggested lions and tigers! But when I started my research, I immediately got distracted by all the reports of mysterious big cats. So here’s another mysteries episode!

Here are the links to some Patreon episodes that I’ve unlocked for anyone to listen to. Just click on the link and a page will open, and you can listen on the page. No need to log in.

Marsupial lions

Blue tigers and black lions

The Queensland tiger, which is not actually about any kind of actual tiger

A lion and cub. This picture made me die:

The Barbary lion, possibly extinct, possibly not:

Watch out! Tigers!

A king leopard with stripe-like markings instead of spots:

Further reading:

Hybrid and Mutant big cats

Peruvian mystery jaguar skulls studied

Show transcript:

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

This week we’re going to learn about some mystery big cats. We’ve touched on big cats before in various episodes, including the British Big Cats phenomenon in episode 52. We’re definitely going to see some more out of place animals this week, along with lots of information about big cats of various kinds. Thanks to Damian who requested an episode about lions and tigers ages ago.

I’ve also unlocked three Patreon episodes so that anyone can listen to them. They won’t show up in your feed, but there are links in the show notes and you can click through and listen on your browser without needing a patreon login. The first is about marsupial lions and the second is about blue tigers and other big cats with anomalous coat colors. The sound quality on the blue tigers episode is not that great, but it’s a long episode with lots of information about blue tigers, white tigers, black tigers, white lions, king cheetahs, and lots more. The third is about the Queensland tiger, an Australian animal that’s not a feline of any kind, but why not?

The term big cat refers to tigers, lions, leopards, snow leopards, and jaguars, but it can also include cheetahs and cougars depending on who you ask. Big cats have round pupils instead of slit pupils like domestic cats and other smaller cats.

Lions, tigers, leopards, and jaguars can all roar. Snow leopards, cheetahs, and cougars can’t. But snow leopards, cheetahs, and cougars can purr, while lions, tigers, leopards, and jaguars can’t. The ability to roar is due to special adaptations in the larynx, but these adaptations also mean big cats can’t purr. So basically a cat can either roar or purr but not both.

The word panther, incidentally, refers to any big cat and not to a specific type of animal. So a black panther, in addition to being an awesome movie, is any kind of big cat exhibiting melanism, which causes the animal’s fur to be black all over. Leopards and jaguars are most commonly referred to as black panthers. Lions, tigers, and cheetahs do not exhibit true melanism as far as researchers have found.

Let’s start with lions. Lions live only in Africa these days, but were once common throughout parts of southern Asia too and possibly even parts of southern Europe. The lion is most closely related to the leopard and jaguar, less closely related to the tiger and snow leopard, but it’s so closely related to all those big cats that it can interbreed with them in rare cases.

There are two species of lion, the African and the Asian. Until recently there were also several subspecies of African lions, including the American lion, which once lived throughout North and South America. It only went extinct around 11,000 years ago. The American lion is the largest subspecies of lion ever known, about a quarter larger than modern African lions. It probably stood almost four feet tall at the shoulder, or 1.2 meters. Cave paintings and pieces of skin preserved in caves indicate that its coat was reddish instead of golden. It lived in open grasslands like modern lions and even in cold areas. There are reports of a reddish, short-maned cat supposedly called a “jungle lion” sighted in South America, but I can’t find much information about it and it’s much more likely to be a jaguar or cougar than a relic population of American lions. But wouldn’t that be awesome if it was.

The Barbary lion was a subspecies of African lion that lived in northern Africa until it was hunted to extinction. The Barbary lion was the one that battled gladiators in ancient Rome and was hunted by pharaohs in ancient Egypt, a big lion with a dark mane. The last one was supposedly killed in 1922, but recent research indicates that they survived much longer—maybe as late as 1958 or later. The last recorded sighting was in 1956, but the forest where it was seen was destroyed two years later.

One zoo in Morocco claims that their lions are purebred Barbary lions, descended from royal lions kept in captivity for centuries. But since we don’t have a full genetic profile of the Barbary lion to start with, it’s hard to determine whether the royal lions are Barbary lions. So far a 2005 DNA test on five of the royal lions indicates they probably aren’t, but DNA testing has come a long way since then and new tests on the royal lions and on preserved Barbary lion skins will hopefully be done soon.

The Sumatran golden lion, also called the cigau [pronounced chee-gow] is a mystery lion that is supposed to be golden in color with no markings, a relatively short tail, and with a mane or ruff of fur that’s sometimes described as white. It’s only about the size of a small donkey or large goat, but stocky like a lion. The most recent sightings are from the 1960s, where one supposedly attacked and killed a man. Some researchers think it may be a subspecies of the nearly extinct Asiatic lion, but others say it’s more likely to be an animal of folklore. Then again, there are tigers on Sumatra and it’s always possible it’s an anomalous coated tiger with no stripes, or stripes that are almost the same color as its coat. Tigers do have a white ruff around the face.

Lions are well known to live on the savanna despite the term king of the jungle, but they do occasionally live in open forests and sometimes in actual jungles. In 2012 a lioness was spotted in a protected rainforest in Ethiopia, and locals say the lions pass through the reserve every year during the dry season. That rainforest is also one of the few places left in the world where wild coffee plants grow. So, you know, extra reason to keep it as safe as possible.

Let’s talk about tigers next. Tigers are awesome animals, with the Bengal tiger being the biggest big cat alive today—on average even bigger than the lion. Tigers are good swimmers and most really like the water, unlike most cats. They live throughout Asia but once were much more common and widespread. I’ve found a lot of mystery tiger reports, but if you’re interested in tigers of unusual colors, I really do recommend you go listen to the unlocked Patreon episode about blue tigers.

The so-called beast of Neamt is a modern mystery from Romania. In spring of 2016, farmers started finding livestock killed during the night, but not eaten. The predator was clearly extremely strong, much stronger and larger than a dog. Its method of killing didn’t suggest a bear, which locals were familiar with anyway.

Some of the sightings seem normal, of a catlike animal the size of a calf. Other sightings were more bizarre. Some people reporting seeing a huge animal running on two legs, one guy said he’d wounded it with an axe but it didn’t bleed, and of course there were the predictable reports that animals it killed were drained of blood.

But in this case, DNA testing solved the mystery of what was killing the animals. The beast was injured by a barbed-wire fence, and a test of its blood indicated it was a Siberian tiger. The Siberian tiger is also called the Amur tiger, which we talked about in episode 44, Extinct and Back from the Brink. But there are probably no more than 500 Siberian tigers alive in the wild, and none of them live within 3,000 miles of Romania, or 5,000 km. So while we know what the beast of Neamt is, we don’t know how it got there. Out of place tigers, hurrah!

Another mystery tiger is from Chad in Africa. This one is sometimes called the mountain tiger, and it’s supposed to be the size of a lion but with reddish fur, white stripes, no tail, and huge fangs.

This doesn’t sound like anything alive today—but it does sound like an extinct cat called Machairodus. It was the size of a lion, or over 3 feet tall at the shoulder, or 1 meter, and around 6 ½ feet long, or 2 meters. It was a type of saber-toothed cat like Smilodon, although it wasn’t closely related to Smilodon and its fangs weren’t as big. It probably had a short tail. But Machairodus and its relatives died out probably a million years ago, although it might have persisted to only 130,000 years ago. That’s still a lot of years, so it’s not too likely that a population of its descendants still lives in Chad. For one thing, northern Chad is part of the Sahara, while southern Chad is a savanna. It’s not dense jungle or remote mountains.

But there are similar reports of the mountain tiger in other parts of Africa, where there are steep mountain ranges that aren’t well explored. And, oddly enough, similar reports also come from South America and even from Mexico. Machairodus did live in Africa, Eurasia, and North America, although its fossils haven’t been found in South America. Maybe the reports aren’t of a living animal but were inspired by fossil remains. Hunters who stumbled across fossil machairodus bones would recognize them as similar to tiger or lion skeletons, but wouldn’t know that the living animal was long gone.

Another South American big cat report comes from Ecuador. It’s called the rainbow tiger or rainbow jaguar, and it sounds really pretty. In the Macas region in southeastern Ecuador, in the Amazon jungle, locals have a story about a big cat properly called Tshenkutshen. The cat is the size of a jaguar, or up to six feet long not counting the tail, or 1.85 meters, but instead of having a pattern of dark rosettes on a tawny background coat, the rainbow tiger is black with stripes on its chest. The stripes are different colors: white, red, yellow, and black, which gives it the rainbow name. One report I saw says it’s white with black spots in addition to the stripes on its chest. It lives in the trees in remote areas, is rare, and at least one report says it has a hump on its shoulders and monkey-like forepaws but with claws. One was supposedly shot and killed in 1959, but there are no pictures of the carcass and no one knows where it went, if it even existed in the first place.

Naturally, the rainbow tiger isn’t actually a tiger since tigers don’t live in South America. If it is a real animal and not a folktale, it’s probably a type of jaguar. But the whole monkey hands thing implies it’s probably more of a mythological creature than a flesh and blood one, because no feline of any kind has forepaws that resemble hands.

There’s an interesting addition to the rainbow tiger mystery. Dutch primatologist Dr. Marc van Roosmalen spotted a strange jaguar during an expedition through Brazil in the late 1990s. It was mostly black, but had a white pattern around its throat.

There are plenty of other South American big cat mysteries, including the yemish that we covered in episode 59 along with the onza, a mystery cat from Mexico and central America. But one especially interesting report is from Peru. Peter Hocking is a Peruvian ornithologist, or someone who studies birds, but he’s also interested in other animals. In 1996 he got his hands on two skulls that were similar to jaguar skulls but reportedly not from jaguars, but from strange striped big cats instead.

In 2010, zoologist Darren Naish asked for and finally received high-quality plaster replicas of the skulls so he could study them. His conclusion is that both skulls are actually from jaguars, but he points out that most big cat species do occasionally produce anomalously striped individuals. No one knows where the pelts of these two jaguars are, unfortunately. Hopefully they’ll turn up eventually, or another striped jaguar will be found and can be studied so we can learn if it’s just an individual with an anomalous coat pattern, or an actual subspecies of jaguar with stripes instead of spots.

I couldn’t find any mystery cheetah reports beyond one called the Tennessee red cheetah. That excited me because I live in Tennessee and I’d never heard of it before. The Tennessee red cheetah is supposed to resemble the cheetah, golden brown with black spots, but with a reddish dorsal stripe and tail. Some reports say it’s reddish-brown all over with black spots.

That’s it. That’s all the information I can find. I was so disappointed, but basically it sounds like a tall tale or maybe a sighting of a jaguar. That’s the problem with mystery big cat reports. There are so many reports of so many animals that don’t correspond to any known species or subspecies of big cat, with few concrete details. In the case of the Tennessee red cheetah, the only details I could find were vague stories about one being shot and skinned, but the skin was missing. No date, no place, no names, nothing.

You can’t treat a report like that with anything but skepticism, so let’s move on to another mystery big cat, the Zanzibar leopard. When I was making notes for this episode, I wrote “probably extinct, may be too depressing to use.” But there’s always a chance it’s not extinct.

The Zanzibar leopard lives on Zanzibar Island off of Tanzania. It’s not a big island, only around 50 miles long, or 85 km, and 20 miles wide, or 30 km. The Zanzibar leopard was probably separated from the mainland population of leopards when sea levels rose after the last ice age. It’s smaller than a mainland leopard, with smaller spots, but not much is known about it since it hasn’t been studied in the wild and it may be extinct now. Unfortunately, many people on the island believed that the leopards were witches’ familiars, and that they should be killed. In 1964 the islanders overthrew the government, but also unfortunately, the newly installed government persecuted people it decided were witches. This included a government-run campaign to kill all leopards on the island. By the mid-1990s, conservationists suspected the Zanzibar leopard was extinct.

But there is hope. Earlier this year an Animal Planet show caught footage on a camera trap of what appears to be a Zanzibar leopard. Hopefully there are still some of the leopards remaining, and if so, hopefully they can also be protected.

Speaking of Tanzania, let’s finish with a big cat that might very well be a real animal—or something even more mysterious. The nunda is supposed to be a huge gray cat with tabby stripes, reported in Tanzania. Its paw prints are supposed to resemble a leopard’s, but are as big as a lion’s.

In a 1927 article, a British administrator named William Hichens reported about his investigation into nunda attacks around the village of Lindi in Tanzania. The attacks occurred in 1922, and started with a night watchman who was found dead one morning. Clutched in the dead man’s hand was a tuft of gray fur that Hichens thought might have been torn from a lion’s mane. But lions were rare in that part of Tanzania, and two locals reported seeing a huge brindled cat attack the man during the night. A few nights after that, another watchman was also killed in the same way, including the tuft of hair clutched in one hand, and that was followed by more attacks in other villages over the next several weeks. The attacks stopped, but resumed in the 1930s. Some huge footprints and more of the gray fur were found by a British hunter who tried to track the animal.

So what might the nunda be? The description doesn’t sound like any known big cat. Cryptozoologist Bernard Heuvelmans suggested it might be a huge African golden cat with anomalous markings. The African golden cat is related to the caracal and the serval, both fairly small, long-legged cats. It has variable markings and coloring, from reddish to grey, from spotted to nearly plain. But it’s only about twice the size of a domestic cat. Its paws are large for its size, but it’s not anywhere near the size of a leopard, much less a lion.

Of course, it might be a larger subspecies of golden cat, or a totally different species. But there is another possibility, one that’s far creepier and darker than an unknown big cat.

According to a book called Wild Cats of the World by Mel and Fiona Sunquist, published in 2012, in the early 20th century a group of witch doctors in that part of Tanzania ran an extortion racket. They demanded money from people and threatened to turn into lions and kill them if they didn’t pay up. And they did kill people—over 100 of them, according to the book. The murders were committed by young men who dressed like lions, including wearing lion paws on their feet so they left lion paw prints.

That would explain the rash of murders in a localized area, and the fact that so many of the victims were found clutching gray fur. The fur was never tested and could have come from any animal and been planted on the victims.

Zoologist Karl Shuker suggests that if the deaths weren’t due to these lion-men, the mystery big cat might be a type of leopard with stripes instead of spots. Leopards with stripes due to genetic coat anomalies are extremely rare, but they aren’t unheard-of. They’re sometimes referred to as king leopards. I have a picture of one in the show notes. While leopards can cross-breed with tigers, tigers don’t live in Africa, so a striped leopard-tiger hybrid wouldn’t be hanging around in Tanzania, certainly not in the 1920s.

Whatever the cause, no one has reported a nunda sighting in about 80 years.

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 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.

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