Episode 327: The Humble Marmot

Posted on by

Podcast: Play in new window | Download (Duration: 8:56 — 9.9MB)

Subscribe: RSS | More

Thanks to Dean for suggesting this week’s topic, the marmot!

Thanks also to Al-Ka-Lines Studio for the beautiful bat pin! You should definitely visit their online shop, because all their jewelry is hand-made by the two of them.

Further reading:

The secret to longevity? Ask a yellow-bellied marmot

The yellow-bellied marmot doing a sit [By Inklein, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=2675916]:

A groundhog keeping an eye out for danger:

Show transcript:

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

This week we’re going to have a short little episode about a short little animal suggested by Dean, although I don’t know if Dean is short and/or little. Probably not. The name Dean makes me think of a tall person, probably someone who plays sports and can run really fast, so basically completely unlike a marmot. Dean suggested the marmot, specifically the yellow-bellied marmot.

Before we get started, two quick notes. First, thanks so much to Kathi and Alex of Al-Ka-Lines Studio for the gorgeous bat pin! They make hand-crafted leather jewelry and while they usually sell wholesale to shops, I checked with Kathi to see if it was okay to link to their shop and they said that yes, they sometimes sell to individuals too. I’ve put a link in the show notes in case you’re interested in seeing what they have for sale. They recently started listening to the podcast in order from the first episode and so far they’re not sick of my voice yet.

Second, I’ll be at Furry Weekend Atlanta this coming weekend, assuming you’re listening to this episode when it comes out on May 8, 2023. If you’re going to be there too, let me know and we can meet up. I went to way too many conventions last year so this one and Dragon Con at the end of August are the only ones I have planned this year, and I’m not on any programming on either. I just plan to look at people’s amazing costumes and attend interesting panels and have fun dancing in the evenings. Also, I’ll probably eat a lot of pizza.

Now, on to the marmots!

If you live in North America, you may have seen a marmot without realizing it. I didn’t realize that the groundhogs that are pretty common where I live in the eastern United States are a type of marmot. Similarly, if you live in the western part of North America, especially in mountainous areas, you may have seen the yellow-bellied marmot. Other species of marmot live in Asia, Europe, and other parts of North America. One interesting thing is that the groundhog of eastern North America is actually more closely related to the marmots of Europe and Asia than it is to the other North American marmot species.

Marmots are big rodents related to squirrels, and in fact they’re considered a type of ground squirrel along with the closely related chipmunks and prairie dogs. They dig burrows and mostly eat plant material, and can grow quite large. The largest species is probably the Olympic marmot that only lives in the state of Washington in the Pacific Northwest of North America, which can weigh up to 18 lbs, or 8 kg. That’s its summer weight, though, when it’s had time to eat lots of food. All marmots hibernate and during that time they survive on the fat reserves they build up in warm weather. Basically all marmots are about the size of a cat, but they’re big chonks with short legs, short tails, little round ears, and a blunt muzzle. Its thick fur makes it look even larger than it really is.

The yellow-bellied marmot mostly lives in higher elevations and, like all marmots, it’s well adapted to cold weather. It’s a social animal that lives in small colonies and spends most of its time underground when it’s not out finding food. It’s mostly brown with yellowish markings underneath and a spot of white between its eyes. It usually digs its burrow among rocks and can have multiple burrows in its territory, so if it spots a predator it doesn’t have far to run to get safely underground. It digs an especially deep burrow to hibernate in, sometimes as much as 23 feet deep, or 7 meters. Since it spends as much as eight months hibernating every year, it needs to stay comfortable. It lines its sleeping chamber with dried leaves and even digs a little side burrow that acts as a latrine.

In a study released in March of 2022, a team of scientists studying yellow-bellied marmots discovered that when it hibernates, an adult marmot’s body basically stops aging. The marmot exhibits true hibernation where its body temperature drops almost to the air temperature and its breathing and heart rate slow dramatically. It will hibernate for a week or two, wake up slightly for about a day so it can stretch and rearrange itself more comfortably, and then will go back into hibernation for another few weeks. This goes on for almost three-quarters of the year and during that time, the yellow-bellied marmot doesn’t eat or drink anything. It just lives off its fat reserves, and because its metabolic rate is so low it hardly uses any energy on any given day, only burning about a gram of fat. A small paperclip weighs about a gram, to give you a comparison. As a side effect, the marmot basically only ages during the summer when it’s active. The scientists think this may be the case for all animals that hibernate.

Like other marmots, the yellow-bellied marmot starts its mating season as soon as it emerges from hibernation around May. Males may have several mates and they all live together with him. Females give birth to around four babies during the summer, which like kittens and puppies are born without fur and with their eyes still sealed shut. They stay in the mother’s nesting burrow for the next six weeks, at which point they can see and have grown fur, so they can go outside with their mother. The babies stay with their mother for up to two years.

Most marmot species are social like the yellow-bellied marmot, but the groundhog is different. It’s mostly solitary, although it’s still part of a complex social network of all the groundhogs in a particular area, and sometimes it will share a burrow with other groundhogs. It also prefers lower elevations while most marmots prefer high elevations. It lives throughout most of the eastern United States and throughout much of Canada.

Because the marmot is a relatively big, common animal, it’s an important food source for many animals. Bears will sniff out marmot burrows and dig them open, and badgers, foxes, coyotes, and mountain lions eat lots of marmots in North America. In Europe and Asia, marmots are frequently eaten by foxes, wolves, snow leopards, and hawks. People will eat them too. In parts of Mongolia where marmots are common, it’s been a food source for thousands of years, traditionally prepared on special occasions by putting hot stones into the dead animal’s body cavity and letting the heat cook the meat slowly. But the marmot can carry diseases that humans can catch, including the plague, so these days a dead goat is often used instead of a marmot.

After I learned this, I naturally got distracted and started reading about other traditional Mongolian foods, and now I suddenly remember that I haven’t eaten anything today but trail mix and toast. So I’ll leave you with a final marmot fact. When a marmot sees a predator, it will whistle to warn other marmots, and the whistle sounds like this:

[marmot whistle]

Now I’m going to go make myself dinner. But it won’t be marmot.

You can find Strange Animals Podcast at strangeanimalspodcast.blubrry.net. That’s blueberry without any E’s. 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 Podchaser, or just tell a friend. We also have a Patreon at patreon.com/strangeanimalspodcast if you’d like to support us for as little as one dollar a month and get monthly bonus episodes.

Thanks for listening!

Episode 326: The Harpy Eagle and Friends

Posted on by

Podcast: Play in new window | Download (Duration: 12:55 — 14.4MB)

Subscribe: RSS | More

Thanks to Eva and Anbo for suggesting the harpy eagle!

Further reading:

Crested Eagle Feeding a Post-Fledged Young Harpy Eagle

Harpy eagle with a food [By http://www.birdphotos.com – Own work, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=3785263]:

The harpy eagle has great big feet and talons:

The harpy eagle with its feather crown raised [photo by Eric Kilby]:

The New Guinea harpy eagle looks similar to its South American cousin [By gailhampshire from Cradley, Malvern, U.K – New Guinea Harpy Eagle. Harpyopsis novaeguineae, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=86187611]:

Ruppell’s griffon vulture:

Show transcript:

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

We’ve been talking about a lot of mammals lately, so let’s have an episode about birds. Anbo suggested the harpy eagle not too long ago, and a much longer time ago Eva suggested the harpy eagle and other raptors.

The word raptor can be confusing because it refers to a type of small theropod dinosaur as well as a type of bird. When referring to a bird, the term raptor includes eagles, hawks, vultures, owls, and other birds of prey. And that includes the harpy eagle.

The harpy eagle lives throughout much of Central and South America, although not as far south as Patagonia. It has a wingspan up to about seven feet across, or over 2 meters, and like other raptors, females are larger than males. This isn’t an especially big wingspan for an eagle, but that’s because the harpy eagle hunts in forests and needs short, broad wings that allow it to maneuver through branches.

The harpy eagle is a beautiful bird. It has a light gray head and darker gray or black body, and is white underneath with delicate black stripes on its leg feathers, with broader stripes on its tail and wings. It has a black ring around its neck, huge yellow feet with enormous talons, and a black bill. Each talon, which is the term for a raptor’s claws, can be over 5 inches long, or 13 cm, while its feet in general are bigger than a grown man’s hand, even if the man has especially big hands.

Most striking of all is the harpy eagle’s crest, also sometimes referred to as a crown. The crown is made of long, rounded feathers and most of the time they don’t show very much. When a harpy eagle is alarmed, it raises the feather crown and poofs out the feathers on its face, which makes its head look bigger and sort of owl-shaped.

The harpy eagle mostly lives in lowland rainforests. It mates for life and doesn’t have babies every year. Every two or three years a harpy eagle pair will build a huge nest out of sticks in the top of the tallest tree they can find. The female lays two eggs, which the parents care for together. The female spends most of her time incubating the eggs while the male brings her food, although he will also take a turn incubating while she goes out to stretch her wings and do a bit of hunting herself. When the first egg hatches, the parents bring the baby lots of food and give it lots of attention–but they ignore the other egg at that point, which usually doesn’t hatch as a result. A harpy eagle chick is all white at first, and although it can fly at around 6 months old, its parents will keep feeding it for almost another year.

The harpy eagle is increasingly threatened due to habitat loss and poaching. Because it’s such a big bird, many people shoot it because they think it’s dangerous to livestock or children. But it mostly eats monkeys, sloths, kinkajous and coatis, iguanas, and other medium-sized animals. It’s rare that it attacks livestock since it mostly hunts within the tree canopy for arboreal animals. If your lambs and chickens are sitting on tree branches, you already have a bigger problem than harpy eagles eating them.

A captive breeding program has been started in various zoos around the world, while conservationists work to protect the harpy eagle’s natural habitat so that individuals can be released back into the wild.

We don’t actually know all that much about the harpy eagle, but we know even less about its close relation, the New Guinea harpy eagle. It resembles the harpy eagle but instead of being mostly gray and white, it’s mostly brown and cream in color. It has longer legs and tail but is smaller overall than the harpy eagle, with a wingspan closer to 5 feet across, or 1.5 meters. It has a smaller crest than the harpy eagle too.

Like its South American cousin, the New Guinea harpy eagle hunts in forests, especially rainforests, and spends most of its time perched in a tree, watching for small animals to happen by. Sometimes it will shake a branch to startle any animals in the area to run or fly away, at which point the eagle flies after them. It will even climb around in a tree and poke around in any potential hiding places it finds. It eats tree kangaroos, possums, and other small to medium-sized mammals, but it also eats a lot of birds and reptiles.

While it’s closely related to the harpy eagle, the New Guinea harpy eagle is placed in a different genus. This is also the case for another closely related bird, the crested eagle, which lives in parts of South America. It’s a little smaller than the harpy eagle of South America, with a wingspan of not quite 6 feet across, or 1.8 meters, with a black mask marking over its eyes and a black spot on its crest. Other than that it’s mostly gray.

The two species look enough alike that sometimes people confuse the crested eagle for a young harpy eagle where their ranges overlap. But in at least one documented case, the birds seemingly got confused too.

In early 2004, a team of scientists observing a harpy eagle nest noticed something odd. The nest had one baby in it that was about a month old when the scientists first observed it, and they noticed a crested eagle perched nearby. Every time the scientists visited the nest, the crested eagle seemed to be nearby, although the harpy eagle parents were also around and seemed just fine. The scientists observed the crested eagle adding branches to the nest and even bringing food to the harpy eagle baby. This continued for almost a year. The baby actively solicited food from the crested eagle and happily ate what it brought. At the same time, the harpy eagle parents allowed the crested eagle to approach, although generally the crested eagle didn’t come very close when the harpy eagle parents were around.

The scientists published a short paper about these observations in 2006, including a few hypotheses about the crested eagle’s behavior. They suggested that the crested eagle might have lost her own chick and transferred her maternal instincts to another eagle chick nearby, or she might have just been responding to the eagle chick’s requests for food. She might even have wanted to use that tree for her own nest, but when the bigger, stronger harpy eagles moved in, she abandoned her nest but hung around. A male crested eagle wasn’t observed, so it’s also possible she had lost her mate.

Sometimes different species of raptor do feed each other’s nestlings, although we don’t know why. It also occasionally happens with other types of birds, often male birds whose own nests are still being incubated by the female or by birds whose nest is very close to another nest with babies in it.

Another raptor that hunts animals that live in trees is the crane hawk, also from South America. It lives in forests that are near water and usually hunts by sitting in a tree and watching for potential prey. A lot of the time, though, it hunts like the New Guinea harpy eagle, climbing around in a tree and poking through any nooks and crannies to find animals that are hiding. In the case of the crane hawk, though, it actually has double-jointed legs that allow it to reach a foot into a little hole in a tree to grab prey. Most birds don’t have legs that are flexible enough to allow this behavior. The crane hawk eats a lot of nestling birds, bats, frogs, and other small animals that hide in tree cavities, including some larger invertebrates like cicadas and snails. The only other raptor known to both hunt like this and have double-jointed legs is a genus of African harrier-hawks that aren’t related to the crane hawk. Yes, it’s convergent evolution, at it again!

Let’s get out of the trees now and finish with another raptor Eva suggested. We talked about Ruppell’s griffon vulture in episode 159, but only very briefly.

Ruppell’s griffon vulture is a critically endangered vulture that lives in parts of central and eastern Africa. Unlike the raptors we’ve talked about so far in this episode, it spends a lot of its time soaring at high elevations, so it has really big wings. Its wingspan is as much as 8 and a half feet across, or 2.6 meters. It’s mostly brown and black and like other vultures, it doesn’t have feathers on its head, just a little bit of thin fluff. It will travel enormous distances to find the dead animals it eats, sometimes following herds of migrating animals to scavenge individuals that die of injury or illness. It doesn’t just eat the yummy soft parts of a carcass, it will also eat bones and even the hide of a dead animal. It has a long neck that helps it get to the best bits of its food, uh, from the inside of the carcass. It sometimes even climbs completely inside the rib cage of a dead animal to more easily get every scrap of food.

The way vultures eat is gross, which makes it fun for me to talk about, but vultures are incredibly important. They actually help stop the spread of diseases like rabies and anthrax by eating animals that died of the diseases. The vulture’s digestive tract is so effective that it kills off any viruses that caused the animals to die.

Ruppell’s vulture mates for life. It nests in cliffs, with hundreds of vulture pairs nesting very close together. The female lays one egg, and both parents take care of the baby when it hatches. Even after it can fly, the parents take care of their chick for almost a year while it learns how to find food on its own. Most vultures have relatively weak feet since they don’t use them to catch prey like other raptors, but Ruppell’s vulture has strong feet to help it perch on the cliffs where it nests.

Ruppell’s griffon vulture is one of the highest-flying birds known. It’s been recorded flying as high as 37,000 feet, or 11,300 meters, and we know it was flying at 37,000 feet because unfortunately it was sucked into a jet engine and killed. There’s so little oxygen at that height that a human would pass out pretty much instantly, but the vulture’s blood contains a variant type of hemoglobin that’s more efficient at carrying oxygen than ordinary hemoglobin.

As if all that weren’t enough for one bird, Ruppell’s vulture can also live to be 50 years old. That’s pretty good for an animal that mostly eats rotting and diseased meat.

You can find Strange Animals Podcast at strangeanimalspodcast.blubrry.net. That’s blueberry without any E’s. 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 Podchaser, or just tell a friend. We also have a Patreon at patreon.com/strangeanimalspodcast if you’d like to support us for as little as one dollar a month and get monthly bonus episodes.

Thanks for listening!

Episode 325: The Burrunjor

Posted on by

Podcast: Play in new window | Download (Duration: 7:59 — 9.1MB)

Subscribe: RSS | More

We have merch available again!

Thanks to Will for suggesting this week’s topic, the burrunjor!

Muttaburrasaurus had a big nose [picture by Matt Martyniuk (Dinoguy2) – Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=3909643]:

The “rock art” that Rex Gilroy “found”:

Show transcript:

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

Recently, Will suggested we learn about an Australian cryptid called the burrunjor. As it happens, this is a short chapter in my book Beyond Bigfoot & Nessie: Lesser-Known Mystery Animals from Around the World, which is available to buy if you haven’t already. I’ve updated it a little from the chapter, so even if you have the book I think you’ll find this a fun episode.

Dinosaurs once lived in what is now Australia, just as they lived throughout the rest of the world. Similar to the southwestern United States reports of little living dinosaurs that we talked about in episode 252, some people in northern Australia report seeing living dinosaurs running around on their hind legs—but these dinosaurs aren’t so little.

The burrunjor, as it’s called, is often described as looking like a Tyrannosaurus rex. Mostly, though, people don’t actually see it. Instead, they hear roaring or bellowing and later see the tracks of a large, three-toed animal that was walking on its hind legs.

One Australian dinosaur that people mention when trying to solve the mystery of the burrunjor is Muttaburrasaurus. It was an ornithopod that grew up to 26 feet long, or 8 meters. It walked on its hind legs and had a big bump on the top of its muzzle that made its head shape unusual. No one’s sure what the bump was for, but some scientists speculate it might have been a resonant chamber so the animal could produce loud calls to attract a mate. Other scientists think it might have just been for display. Or, of course, it might have been both—or something else entirely. None of the Australian dinosaur sightings mention a big bump on the dinosaur’s nose. Muttaburrasaurus also had four toes on its hind feet, not three, and it disappeared from the fossil record about 103 million years ago. It also probably ate plants, not meat.

Another suggestion is that the burrunjor is a megaraptorid that survived from the late Cretaceous. These dinosaurs looked like theropods but with longer, more robust arms. Most scientists these days group them with the theropods. Most of the known specimens are from what is now South America, but two species are known from Australia, Australovenator and Rapator.

Australovenator is estimated as growing up to 20 feet long, or 6 meters, and probably stood about the same height as a tall human. It was a fast runner and relatively lightly built. It disappeared from the fossil record around 95 million years ago, not that we have very many bones in the first place. We only know Rapator from a single bone dated to 96 million years ago. It was probably related to Australovenator, although some paleontologists think Australovenator and Rapator are the same dinosaur. Either way, it’s doubtful that any of these animals survived the extinction event that killed off all the other non-avian dinosaurs.

“Burrunjor” is supposed to be a word used by ancient Aboriginal people to describe a monstrous lizard that eats kangaroos. But in actuality, Burrunjor is the name of a trickster demigod in the local Arnhem Aboriginal tradition and has nothing to do with reptiles or monsters. The Aboriginal rock art supposedly depicting a dinosaur-like creature doesn’t resemble other rock art in the region and isn’t recognized by researchers or Aboriginal people as being authentic.

All accounts of the burrunjor trace back to a single source, an Australian paranormal writer named Rex Gilroy. Gilroy was the one who “discovered” the rock art of a supposed dinosaur and none of the sightings he reports appear in local newspapers. The first mention of the word burrunjor referring to a monster appears in 1995, when Gilroy’s book Mysterious Australia was first published. According to Gilroy, the most recent burrunjor sighting is from 1985, when a family driving to Roper River reported seeing a feather-covered dinosaur that was 20 feet long, or 6 meters. But again, that report doesn’t appear in the newspapers, just in Gilroy’s books.

Gilroy’s burrunjor is probably a hoax, but there is a big lizard in Australia that sometimes stands on its hind legs. Monitor lizards live throughout Australia and are often called goannas. The largest Australian species can grow over 8 feet long, or 2.5 meters. All monitor lizards, including the Komodo dragon that lives in Indonesia, can stand on their hind legs. The lizard does this to get a better look at the surrounding area. It uses its tail as a prop to keep it stable and can’t actually walk on its hind legs, but an 8-foot lizard standing on its hind legs might look like a dinosaur from a distance.

An even bigger monitor lizard, called Megalania, lived in Australia until at least 50,000 years ago and maybe much more recently. It’s possible that Aboriginal Australians lived alongside it, although there’s no evidence for this either way. (Unless you count the evidence that that would be really really cool.)

Megalania is considered the largest terrestrial lizard known. Dinosaurs weren’t lizards and crocodilians aren’t either, but monitor lizards are. We don’t have any complete fossils of Megalania but its total length, including its tail, is estimated to be as much as 23 feet long, or 7 meters. This is more than twice the length of the Komodo dragon, the largest lizard alive today and a close relation. Like the Komodo dragon, Megalania was probably venomous.

As for Rex Gilroy, he recently passed away at the age of 79 and his books about the burrunjor are out of print. Rest in peace, burrunjor man.

You can find Strange Animals Podcast at strangeanimalspodcast.blubrry.net. That’s blueberry without any E’s. 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 Podchaser, or just tell a friend. We also have a Patreon at patreon.com/strangeanimalspodcast if you’d like to support us for as little as one dollar a month and get monthly bonus episodes.

Thanks for listening!

Episode 324: The Tenrec and Adalatherium

Posted on by

Podcast: Play in new window | Download (Duration: 14:20 — 16.7MB)

Subscribe: RSS | More

We have merch available again!

Thanks to Eva and Leo for suggesting the tenrec!

Further reading:

Marooned on Mesozoic Madagascar

Introduction to Adalatherium hui

The lowland streaked tenrec:

The hedgehog tenrec rolls up just like an actual hedgehog [photo by Rod Waddington, CC BY-SA 2.0, via Wikimedia Commons]:

Actual hedgehog, not a tenrec:

Lesser hedgehog tenrec REALLY looks like an actual hedgehog [By Wilfried Berns www.Tierdoku.com – Transferred from de.wikipedia to Commons.Orig. source: eigene Fotografie, CC BY-SA 2.0 de, https://commons.wikimedia.org/w/index.php?curid=2242515]:

Adalatherium:

Show transcript:

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

This week we’re going to learn about a weird little animal suggested by both Eva and Leo, the tenrec of Madagascar. While we’re at it, we’re going to learn about another little animal found on Madagascar a long time ago that’s one of the weirdest mammals ever discovered.

Before we get started, though, someone sent me a book! If your name is Jennifer or someone named Jennifer mailed this book to me for you, thank you! The book is called The Last Flight of the Scarlet Macaw: One Woman’s Fight to Save the World’s Most Beautiful Bird by Bruce Bercott. Thank you so much! I did not know when I started this podcast over six years ago that one of the benefits of doing an animal podcast is sometimes people send you books about animals, which is the best thing in the world. There’s no note so I thought I’d give you a shout-out on the podcast.

As we learned in episode 318, about 88 million years ago, the island of Madagascar broke off from every other landmass in the world, specifically the supercontinent Gondwana. The continent we now call Africa separated from Gondwana even earlier, around 165 million years ago. Madagascar is the fourth largest island in the world and even though it’s relatively close to Africa these days, many of its animals and plants are much different from those in Africa and other parts of the world because they’ve been evolving separately for 88 million years.

But at various times in the past, some animals from Africa were able to reach Madagascar. We’re still not completely sure how this happened. Madagascar is 250 miles away from Africa, or 400 kilometers, and these days the prevailing ocean currents push floating debris away from the island. In the past, though, the currents might have been different and some animals could have arrived on floating debris washed out to sea during storms. During times when the ocean levels were overall lower, islands that are underwater now might have been above the surface and allowed animals to travel from island to island until they reached Madagascar.

Sometime between 25 and 40 million years ago, a semiaquatic mammal reached Madagascar in enough numbers that it was able to establish itself on the island. It was related to the ancestors of a semiaquatic mammal called the otter-shrew, even though it’s neither an otter nor a shrew. The otter-shrew lives in parts of Africa and is pretty weird on its own, but we’ll save it for another episode one day. The otter-shrew’s relative did so well in its new home of Madagascar that over the millions of generations since, it developed into dozens of species. We now call these animals tenrecs.

It’s hard to describe the tenrec because the various species are often very different in appearance. There are some things that are basically the same for all species, though. First, the tenrec has a low body temperature, although it varies from species to species and also varies depending on time of year. That’s because some species of tenrec go into torpor when it’s cold, or sometimes full hibernation. During torpor the animal’s body temperature drops even more than usual. The common tenrec hibernates up to nine months out of the year.

Second, the tenrec has a cloaca, which is really unusual in placental mammals. Birds, reptiles, and amphibians have a cloaca, which is a single opening used for excretion and often for giving birth or laying eggs too. Most mammals have separate openings for different uses.

Third, all tenrecs are pretty small with only a little short tail. The biggest is only a little over a foot long at most, or 39 cm, and most are much smaller.

Leo specifically likes the streaked tenrec, so let’s learn about it to give us a better idea of what tenrecs are like in general. There are two species of streaked tenrec and while they live in different parts of Madagascar, they mostly live in tropical rainforests. They’re considered a type of spiny tenrec because they have quills all over like a tiny porcupine or a brightly colored hedgehog. The highland streaked tenrec is black and white, while the lowland streaked tenrec is black and yellow.

The streaked tenrec’s bright coloration gives a warning to potential predators that it is pointy. If a predator doesn’t figure it out, the tenrec will raise its quills and shake them to make a little rattling sound. If that doesn’t stop the predator and it tries to bite the tenrec, the quills can detach and will lodge in the predator’s mouth. That generally gets the point across. (haha, point)

The lowland streaked tenrec also communicates by rubbing its quills together to make ultrasonic sounds. This method of sound production is called stridulation and the streaked tenrec is the only mammal known to make sound this way. It has special muscles at the base of its quills that help it move the quills to make sounds. Stridulation is mostly found in insects, including crickets.

Like most tenrecs, the streaked tenrec has a long, thin snout and short legs. It spends a lot of its time digging for earthworms and other invertebrates, and it also eats fruit. It lives in family groups that sleep in shallow burrows. Also, it’s super cute. Just don’t lick it.

Another tenrec with spines is the hedgehog tenrec, which looks and acts incredibly like a hedgehog even though it’s not related. That’s yet another example of convergent evolution. The lesser hedgehog tenrec and the greater hedgehog tenrec, which by the way belong to different genera, are nocturnal animals that live in open forests, savannas, and people’s gardens in Madagascar. During the day it stays hidden in dead leaves or brush, or in a hollow of a tree trunk, and at night it comes out to find insects and other small animals to eat. If it feels threatened, it will roll up into a ball to protect its belly while turning itself into a very pointy mouthful. Its spines don’t come loose the way the streaked tenrec’s do, but they’re sharp. Sometimes a hedgehog tenrec will back up quickly toward a potential predator. If it backs into the predator’s nose, suddenly the predator discovers it’s not all that hungry and its nose hurts and it’s just going to leave.

Many species of tenrec resemble shrews. They’re smaller than a mouse, which they otherwise resemble except that they have a long nose and short tail, and they don’t have quills. Most tenrecs have 6 or 8 babies at a time, but some have more. The common tenrec can have up to 32 babies at a time. It has 29 teats! That’s the most teats known in any mammal.

All this is amazing, but while I was researching the tenrec I learned about an even weirder animal that lived on Madagascar at the end of the Cretaceous. That animal wasn’t a dinosaur, though. It was a mammal.

It was discovered by a team of paleontologists in 1999, but they didn’t actually know they’d discovered it. They thought the piece of rock only contained a small crocodyliform. When preparation of the specimen started in 2002, the scientist working on it received an incredible surprise. In addition to fossil remains of both an adult and a baby crocodyliform, there was an almost complete, articulated skeleton of a weird mammal. All three animals may have been buried suddenly by debris carried by a flash flood, which is why they’re so well preserved.

Most mammals that lived alongside dinosaurs were really small, maybe the size of rats at most, but Adalatherium was about the size of a cat. It may have actually grown larger than a cat, because the only specimen we have is an individual that wasn’t fully grown. It was built sort of like a little badger, with a broad body, short legs, short tail, and short snout.

Adalatherium is a member of a group of mammals called Gondwanatheria, which arose in the southern hemisphere around the time that the supercontinent Gondwana was breaking apart. We only have a few fossils of these animals so paleontologists still don’t know how they’re related, but Adalatherium is a big deal because it’s so detailed and almost the whole skeleton is preserved. Paleontologists have known for a long time that these Gondwanatheria were probably not related to modern mammals, but until Adalatherium was discovered no one realized just how weird these animals were.

If you could go back in time to look at Adalatherium when it was alive, you might not think it was all that weird. Also, you’d be a little distracted because dinosaurs would probably be trying to eat you. Most of the weird details probably weren’t visible, but they’re very obvious to scientists studying the fossilized bones. For instance, Adalatherium had a lot of vertebrae in its backbone, more than other mammals—at least 30 total thoracic and lumbar vertebrae. Humans have 17 total and cats have 20, to give you a comparison with modern mammals.

Adalatherium also had weird legs, with its front legs not really seeming to match its rear legs. Its front legs are longer with a strong shoulder, while its rear legs are short and bowed. Paleontologists think it might have been a burrowing animal, which would explain why its rear legs are strangely shaped compared to its front legs, but it could probably run pretty fast too. It also had unusual double grooves on its anklebones.

Another weird thing about Adalatherium was its skull. The parts of the skull that made up the nasal cavity had lots of little holes in it, called foramina, for nerves and blood vessels to pass through. This isn’t unusual in itself, but Adalatherium had more foramina than any other mammal ever examined, living or extinct. One of the foramen was on top of the snout and doesn’t match up with anything seen in any other mammal. Adalatherium probably had a whole lot of very sensitive whiskers, but for all we know, all the foramina were for some other sensory structure, one that was unlike any found in modern mammals.

Adalatherium lived at the end of the Cretaceous, and it’s possible it went extinct along with the non-avian dinosaurs. Gondwanatheria in general all went extinct by around 43 million years ago and as far as we know, no living descendants are still around. But we know very little about these interesting mammals. Hopefully more fossils of Gondwanatheria in general, and Adalatherium in particular, will turn up soon so we can learn more.

You can find Strange Animals Podcast at strangeanimalspodcast.blubrry.net. That’s blueberry without any E’s. 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 Podchaser, or just tell a friend. We also have a Patreon at patreon.com/strangeanimalspodcast if you’d like to support us for as little as one dollar a month and get monthly bonus episodes.

Thanks for listening!

Episode 323: The Kinkajou

Posted on by

Podcast: Play in new window | Download (Duration: 7:14 — 8.4MB)

Subscribe: RSS | More

Thanks to Lincoln for suggesting this week’s subject, the kinkajou!

Further reading:

Early Primates Groomed with Claws

Not actually a monkey:

Not actually a bear [photo taken from this site]:

Show transcript:

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

This week we’re going to learn about an animal suggested by Lincoln. It’s the kinkajou, an adorable but weird little animal from Central and South America.

In episode 302 we talked about the coatimundi and the olingo, and both those animals are closely related to the kinkajou. So is the raccoon. But the kinkajou is the only member of its own genus that probably started evolving separately from its closest relations around 22 million years ago.

When the kinkajou was first described scientifically in the late 18th century, it was considered to be a type of lemur, which is a primate. At first glance, the kinkajou really does look like a primate in many ways. It’s arboreal, meaning it lives in trees, and it has a long prehensile tail. Its head is rounded with a short snout, and its large eyes are forward-pointing. Its ears are also low on the sides of its head. All these features resemble features common in primates, but the kinkajou isn’t related to primates at all. Eventually biologists figured it out and it was reclassified.

You can tell the kinkajou isn’t a primate if you know what to look for. It has fur on the bottoms of its feet, while primates always have bare skin on the bottoms of our feet and hands. Its fingers also all have long claws, whereas all primates have fingernails. The only exception is what’s called a toilet claw that some primates retain, including lemurs, where one toe has a claw instead of a nail that the animal uses to groom its fur. But no modern primates have claws on all their digits.

The kinkajou is covered with thick, plush fur that keeps it warm in cold weather. Some populations live in high elevations where it can get cold at night, and since it’s a nocturnal animal it needs to stay warm while it’s out looking for food. It’s yellowish-brown in color but some of its hairs are tipped with darker brown. Even though the darker hairs are mixed in with the lighter ones and the kinkajou doesn’t actually have a pattern of darker spots, the dark hairs absorb more light than the lighter hairs and can make it look spotted in low light. This helps it blend in with the dappled shade in the trees where it lives.

The kinkajou and its close relations make up the family Procyonidae, which is classified in the order Carnivora. Carnivora means “meat-eaters,” but Procyonids are all omnivores that don’t eat a lot of meat. The kinkajou mostly eats fruit, and its favorite fruit is the fig. It also eats other plant parts, insects, and honey, but it mostly just wants lots of yummy ripe figs. (Same.)

The kinkajou lives in family groups, typically one female and her young offspring, a dominant male, and a subordinate male. During the day the family members sleep in a tree hollow or in a tangle of branches that give them plenty of shade. When it starts getting dark, the kinkajous wake up and go out looking for food. Sometimes the family forages together but more often they split up and forage on their own. When there’s a lot of food available in one place, like a bunch of fig trees, a whole lot of kinkajous may gather to eat and play together.

Because it spends just about all its life in the treetops, the kinkajou is well adapted to arboreal life. It can turn its hind feet around backwards to help it climb headfirst down a tree trunk, which is another trait it shares with the raccoon. Other animals have evolved the same ability, though, even ones that aren’t closely related to the kinkajou.

The kinkajou’s prehensile tail is strong and thick, and it often hangs from its tail to eat. It’s not a very large or heavy animal, only 10 lbs in weight at the most, or 4.6 kg, and usually less than half that. Because it’s only about the size of a cat, it can climb onto thin branches to pick fruit. It also has an extremely flexible spine, so flexible that it can twist its head and shoulders 180 degrees from its pelvis.

A female kinkajou usually only has one baby at a time, sometimes two. She mostly takes care of the baby herself, although occasionally its dads will play with the baby or help it collect fruit. The baby stays with the family even after it’s able to care for itself, until it grows old enough that it leaves to find its own territory. The kinkajou can live a long time, 30 or 40 years, partly because it doesn’t have very many predators in its treetop habitat.

One other interesting detail about the kinkajou is its tongue. It has a surprisingly long tongue that it can stick far out of its mouth to lick up insects like ants. It also likes nectar and honey, so its long tongue helps it gather both. The kinkajou is sometimes called the honey bear since it likes honey and its fur is the color of honey, but it’s not related to bears any more than it’s related to primates.

One local name for the kinkajou translates to “bear-monkey,” and that’s honestly probably the best name for it–as long as we can remember that it’s not a bear and not a monkey!

You can find Strange Animals Podcast at strangeanimalspodcast.blubrry.net. That’s blueberry without any E’s. 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 Podchaser, or just tell a friend. We also have a Patreon at patreon.com/strangeanimalspodcast if you’d like to support us for as little as one dollar a month and get monthly bonus episodes.

Thanks for listening!

Episode 322: The Javelina and Other Peccaries

Posted on by

Podcast: Play in new window | Download (Duration: 8:55 — 10.1MB)

Subscribe: RSS | More

Thanks to Oceana and Leo for suggesting this week’s episode about the javelina! We’ll even learn about a mystery peccary too.

Further reading:

New Species of Peccary–Pig-Like Animal–Discovered in Amazon Region

A javelina, also called the collared peccary [By Wing-Chi Poon – Own work by uploader; at Cottonwood Campground, Big Bend National Park, Texas, USA, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=4394434]:

Show transcript:

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

This week we have a suggestion by Oceana and Leo, the javelina! It’s an animal native to the Americas, also called the collared peccary. We’re going to learn about it and its close relations, including a mystery animal.

The javelina is in the family Tayassuidae, called the New World pigs. The rest of the world’s pigs, including the warthog and the babirusa and the domestic pig, belong to the family Suidae. While the two families are related, the ancestors of the New World pigs, or peccaries, split off from the ancestors of other pigs around 40 million years ago and they’ve been evolving separately for all that time.

Peccaries live throughout almost all of Central and South America up to southwestern North America and some of the Caribbean islands. All peccaries look like little hairy pigs, including a flat-ended pig snout that it uses to root in the ground, small eyes, short tusks, slender legs with cloven hooves, and a thin little tail. It’s relatively small compared to domestic pigs, about the size of a big dog at most, and is covered with a thick coat of bristly hair. When it’s angry or frightened, it can raise the bristles along its back to make it look larger. It also has scent glands that give off a pungent smell, which is how members of the same herd recognize each other, since peccaries have poor eyesight.

Peccaries mostly eat plant material, but they’re omnivores and will eat meat when they find it, from insects and grubs to frogs and even carrion. Because they root around in the ground and leaf litter, they stir up nutrients in a way that benefits other animals and the environment in general. In the case of the javelina, also called the collared peccary, musk hog, or skunk pig, it’s sometimes considered a pest since it will root up people’s flowerbeds and gardens. But the javelina doesn’t know the difference between a garden and a not-garden. It just wants to find some tasty grubs and roots.

Peccaries are social animals that usually live in small herds. The white-lipped peccary is widespread in the forests of Central and South America, and sometimes lives in herds of 300 animals or more, even as many as 2,000 according to some reports. It requires an enormous range as a result, and travels a lot of the day to find new areas to forage. It’s threatened by habitat loss, mostly deforestation. Like other peccaries, it smells sort of skunky and can be aggressive if threatened. It eats a lot of fruit in addition to other plant material, and because it has stronger jaws than the javelina, it can eat seeds and nuts that the javelina can’t, so the two species can coexist in the same environment without competing for the same food sources.

Until 1972, the Chacoan peccary was only known from some fossils found in 1930. Not only did scientists think it was extinct, they thought it had been extinct for a long time. But in the early 1970s, rumors about a new peccary species started to circulate. A team of biologists followed up with locals and discovered the peccary living in a small area of South America called Chaco. Surprise! New peccary just dropped.

The Chacoan peccary, also known as the tagua, looks a lot like a javelina although it doesn’t have a dew claw on its hind feet. It has a tough snout and brown and gray bristles, with white on its shoulders and around its mouth. It lives in small bands of around a dozen individuals that roam across a large range, eating tough vegetation that other animals wouldn’t even consider food—cacti, for instance. A peccary will roll a cactus around on the ground with its snout and hooves, rubbing the spines off so it can eat it. If that doesn’t work, it will pull the spines out with its teeth. Cacti contain acids that other animals can’t digest, but the Chacoan peccary has specialized kidneys that are adapted to break down those acids.

The Chacoan peccary is endangered due to hunting, habitat loss, and disease. The area where it lives is being rapidly deforested to make way for huge cattle ranches. This is bad enough, but when ranchers move in, they want roads to get to their land more easily, and once the roads are in place, not only can more hunters get to the area, but more peccaries are killed by traffic. It’s estimated that only about 3,000 Chacoan peccaries are alive today. The government of Paraguay is trying to reduce the impact of habitat loss by protecting key areas of forest, and breeding populations are kept in a number of zoos across the world.

There are only three living species of peccary known: the javelina, the white-lipped peccary, and the Chacoan peccary. But there may be a fourth, the giant peccary.

In 2000, a Dutch biologist named Marc van Roosmalen was researching animals in Brazil, and as part of his studies he talked to some local hunters. They showed him the hides of three big peccaries, but they looked different from the ordinary javelinas that lived in the area. Van Roosmalen had already spotted some javelinas that he’d thought seemed too big to be ordinary javelinas, so when he saw the hides he started wondering if there were two peccary species in that part of the Amazon region.

He returned in 2003 with a German filmmaker, who got video footage of a group of these mystery peccaries. They even found a skull. Van Roosmalen described the giant peccary as a new species in 2007, but not everyone agreed it was a new species.

The giant peccary is larger than the javelina but otherwise looks and acts very much like it. Since the javelina is common pretty much everywhere that peccaries are found, and can show a lot of variation in size and appearance, many scientists think the giant peccary is just a population of unusually large javelinas.

The giant peccary reportedly lives in pairs or small family groups instead of herds. The local people have a different name for it to differentiate it from the javelina, a name which means “the big javelina that lives in pairs.” But while a genetic study of the skull found in 2003 determined that the giant peccary diverged from all other peccary species around a million years ago, later analysis is less conclusive.

As of 2011, the giant peccary is in a sort of scientific limbo, waiting for more evidence and further studies to determine whether it’s actually a new species or just a bunch of big javelinas. Let’s hope we learn more about it soon and can clear up the mystery.

You can find Strange Animals Podcast at strangeanimalspodcast.blubrry.net. That’s blueberry without any E’s. 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 Podchaser, or just tell a friend. We also have a Patreon at patreon.com/strangeanimalspodcast if you’d like to support us for as little as one dollar a month and get monthly bonus episodes.

Thanks for listening!

Episode 321: Archaeopteryx

Posted on by

Podcast: Play in new window | Download (Duration: 9:09 — 10.5MB)

Subscribe: RSS | More

We have merch available again!

Thanks to Eilee for suggesting this week’s topic, Archaeopteryx!

Further reading:

Dinosaur feather study debunked

Archaeopteryx fossil provides insights into the origin of flight

An Archaeopteryx fossil [By H. Raab (User: Vesta) – Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=8066320]:

Show transcript:

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

We’ve had a lot of mammal episodes lately, so this week let’s learn about a reptile…uh, a bird. Not quite a bird, not exactly a reptile. That’s right, it’s an episode about archaeopteryx, a suggestion by Eilee!

A quick note before we start to say that I finally got around to setting up merch again if you want to order a t-shirt or water bottle or whatever with the podcast’s logo on it. I’m using Redbubble this time because they have a lot more items available than our previous vendor. There’s a link in the show notes.

We also have new stickers and those are free, so if you want one, just drop me an email and let me know what your mailing address is. The new sticker is a drawing of a capybara made by me. Anyway, on to the archaeopteryx!

The first archaeopteryx fossils were discovered in Germany in 1861. Before the first skeleton of an archaeopteryx was discovered, though, a single feather impression was found in a limestone quarry that has produced a lot of spectacularly well-preserved fossils. When the full specimen turned up later that same year, palaeontologists decided the feather came from the same animal.

That decision has been questioned repeatedly over the years. A study conducted with laser imaging determined that the single feather was different from the feathers of other archaeopteryx specimens. Results of that study were published in 2019, but in October of 2020 results of a study conducted with a specialized electron microscope determined that the feather did come from an archaeopteryx. The 2020 study also found that the feather was black.

Archaeopteryx lived around 150 million years ago in what is now Europe. It was about the size of a crow but while it looked a lot like a bird, it also looked a lot like a little dinosaur. It had small teeth and a long lizard-like tail. Of the twelve Archaeopteryx fossils found so far, all but one have feather impressions that indicate it had flight feathers on its arms, or rather wings, but at least one specimen also had flight feathers on its legs, which are sometimes referred to as hind wings. These hind wings would have helped it maneuver through branches even though its front wings were limited in their range of motion. It was probably a slow flyer that ate whatever small animals it could catch.

The wing feathers of archaeopteryx were very similar to those of modern birds, and a study published in late 2020 discovered another similarity. Birds molt their feathers and replace them the same way mammals shed hairs and regrow them, but it’s a little trickier for birds. A bird that loses too many feathers from its wings can’t fly until new feathers grow in. Modern birds solve this issue by molting only one pair of wing feathers at a time, and once the replacement grows in, the next pair is shed. The study examined fossilized archaeopteryx wings using a process called laser-stimulated fluorescence imaging, which can reveal details that aren’t otherwise visible. It discovered feather sheaths hidden under what would have been the skin of the wings, ready to grow new feathers. The feather sheaths were the same on both wings and resembled the molting pattern seen in modern falcons.

Archaeopteryx also had feathers on the rest of its body, but they aren’t well preserved so paleontologists can’t determine too much about them. They might have been more fluffy than sleek, like the soft downy feathers in young modern birds, or it might be that the fluffy feathers just happened to be the ones that were most preserved.

Palaeontologists study archaeopteryx because it gives us so much information about how birds evolved from dinosaurs. Archaeopteryx was still very much a dinosaur even though it looked superficially like a bird. Microscopic examination of the fossilized cells and blood vessels inside its bones show that it actually grew very slowly. Modern birds grow extremely quickly when they’re young. One scientist pointed out that when you watch a flock of pigeons, you can’t really tell which ones are fully grown and which ones are still quite young, because baby pigeons grow to an adult size so quickly. Dinosaurs grew to their adult size much more slowly, even the small carnivorous dinosaurs that were ancestral to modern birds. The study determined that Archaeopteryx would probably have taken almost three years to grow to its adult size.

The Archaeopteryx fossil called “specimen number eight” was determined to be a different species from the others, in a study published in 2018. It’s about half a million years younger than the other known specimens and has characteristics found in modern birds that the others don’t have. Its adaptations would have made it a better, more efficient flyer. The differences weren’t noticed before because it’s not a very good specimen and many of the bones are damaged and still embedded in the rock where they can’t be seen. The study used a process called synchrotron microtomography to basically take a 3D scan of the fossil and its rock matrix so scientists can study the scan without breaking the rock open and destroying parts of the fossil.

At the time that archaeopteryx lived, the sea levels were much higher than they are now and Europe was mostly a series of large islands in a shallow sea. The part of Europe that’s now Germany was subtropical but fairly dry, without much rain. All the archaeopteryx specimens have been found in limestone that was once mud at the bottom of a placid lagoon, protected from ocean currents and waves by small islands covered with shrubby vegetation. Archaeopteryx probably lived on these small islands, and while we don’t know how it behaved, many paleontologists think it may have hunted both by running on its long hind legs and by flying, just like a lot of birds do today. We have fossilized remains of little lizards and insects that would have made good meals for a hungry archaeopteryx.

What we do know is that sometimes an archaeopteryx had a very bad day and ended up drowning in the lagoon. On rare occasions, the body floated around until it decomposed enough that it sank into the mud at the bottom. Over millions of years, this mud turned into fine-grained limestone that preserved the fossil archaeopteryx remains in incredible detail.

For a long time, people thought archaeopteryx was a so-called missing link between dinosaurs and birds, and that it was the first bird. We now know that isn’t true. There were other bird-like dinosaurs that could fly before archaeopteryx evolved, although archaeopteryx was a very early flying avian dinosaur.

More importantly, we now know that birds are basically very derived dinosaurs. Dinosaurs had so many features we associate with birds, and birds still have so many features we associate with dinosaurs, that it’s hard to decide whether an animal like archaeopteryx was a bird-like dinosaur or a dinosaur-like bird. I guess it was sort of both.

You can find Strange Animals Podcast at strangeanimalspodcast.blubrry.net. That’s blueberry without any E’s. 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 Podchaser, or just tell a friend. We also have a Patreon at patreon.com/strangeanimalspodcast if you’d like to support us for as little as one dollar a month and get monthly bonus episodes.

Thanks for listening!

Episode 320: More Elephants

Posted on by

Podcast: Play in new window | Download (Duration: 11:44 — 13.0MB)

Subscribe: RSS | More

Thanks to Connor and Pranav who suggested this week’s episode about elephants! It’s been too long since we had an elephant episode and there’s lots more to learn.

Further reading:

Asian elephants could be the maths kings of the jungle

Many wild animals ‘count’

A big difference between Asian and African elephants is diet

Study reveals ancient link between mammoth dung and pumpkin pie

The Asian elephant (left) and the African elephant (right):

The African bush elephant (left) and the African forest elephant (right) [photo taken from this page]:

The osage orange is not an orange and nothing wants to eat it these days:

Show transcript:

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

We haven’t talked about elephants since episode 200! It’s definitely time for some elephant updates, so thanks to Conner and Pranav for their suggestions!

Conner suggested we learn more about the Asian elephant, which was one we talked about way back in episode 200. The biggest Asian elephant ever reliably measured was a male who stood 11.3 feet tall, or 3.43 meters, although on average a male Asian elephant, also called a bull, stands about 9 feet tall, or 2.75 meters. Females, called cows, are smaller. For comparison, the official height of a basketball hoop is 10 feet, or 3 meters. An elephant could dunk the ball every single time, no problem.

The Asian elephant used to live throughout southern Asia but these days it’s endangered and its range is reduced to fragmented populations in southeast Asia. There are four living subspecies recognized today although there used to be more in ancient times.

Elephants are popular in zoos, but the sad fact is that zoo elephants often don’t live as long as wild elephants, even with the best care. The elephant is adapted to roam enormous areas in a family group, which isn’t possible in captivity. In the wild, though, the elephant is increasingly endangered due to habitat loss and poaching. Even though the Asian elephant is a protected species, people kill elephants because their tusks are valuable as ivory. Tusks are a modified form of really big tooth, and it’s valuable to some people because it can be carved into intricate pieces of art that can sell for a lot of money. That’s it. That’s the main reason why we may not have any elephants left in another hundred years at this rate, because rich people want carvings made in a dead animal’s tooth. People are weird, and not always the good kind of weird.

In happier Asian elephant news, though, a 2018 study conducted in Japan using zoo elephants replicated the results of previous studies that show Asian elephants have numeric competence that’s surprisingly similar to that in humans. That means they understand numbers at least up to ten, and can determine which group of items has more or less items than another group. That sounds simple because humans are really good at this, but most animals can only understand numbers up to three. It goes one, two, three, lots.

Many animals do have a good idea of numbers in a general way even if they can’t specifically count. Gray wolves, for instance, know how many wolves need to join the hunt to successfully bring down different prey animals. Even the humble frog will choose the larger group of food items when two groups are available. But the Asian elephant seems to have an actual grasp of numbers. I specify the Asian elephant because studies with African elephants haven’t found the same numeric ability.

Elephants make a lot of sounds, such as the iconic trumpeting that they make using the trunk. Way back in episode 8 we talked about the infrasonic sounds elephants also make with their vocal folds, sounds that are too low for humans to hear. But the Asian elephant also sometimes makes a high-pitched squeaking sound and until recently, no one was sure how it was produced. It turns out that the elephant makes this sound by buzzing its lips the same way a human does when playing a brass instrument. It’s the first time this particular method of sound production has been found outside of humans.

This is what a squeaking Asian elephant sounds like:

[elephant squeak]

Pranav suggested we learn more about the African forest and bush elephants. Those are the two species of African elephants that are still alive, and they’re also endangered due to habitat loss and poaching. The forest elephant is critically endangered. The forest elephant lives in forests, as you probably guessed, especially rainforests, while the bush elephant lives in grasslands and open forests. It’s sometimes called the savanna elephant since it’s well adapted to life on the savanna.

The forest elephant is only a little larger on average than the Asian elephant, while the bush elephant is much bigger on average. A big bull bush elephant can stand as much as 13 feet tall, or 4 meters, which means it might not dunk the basketball every time because the basketball hoop is awkwardly low.

The bush elephant lives in areas where it’s often extremely hot and dry. Since large animals retain heat, the bush elephant has many adaptations to stay cool. Its ears are really big, for instance, and have lots of blood vessels. This means the blood is close to the surface of the skin where it can shed heat into the air. In hot weather the elephant can flap its ears to help cool its blood faster. But one big adaptation has to do with its skin. The bush elephant’s skin is covered with what look like wrinkles but are actually crevices in the skin only a few micrometers wide. The crevices retain tiny amounts of water that help keep the elephant cool. Since elephants don’t have sweat glands the way people do, they have to bathe in water and mud to get moisture in the crevices in the first place.

Elephants are megaherbivores, meaning they eat mega amounts of plants. This has an impact on forest dynamics, but until recently the only studies on elephant diets and ecological effects were on African elephants. A 2017 study on Asian elephants in Malaysia found that instead of mostly eating sapling trees, the elephants preferred to eat bamboo, grasses, and especially palms.

In comparison, the African bush elephant eats plant parts that other animals can’t chew or digest, including tough stems, bark, and roots. It also eats grass, leaves, and fruit. The African forest elephant eats a lot more fruit and softer plant parts than the bush elephant, and in fact the forest elephant is incredibly important as a seed disperser. Seeds that pass through the forest elephant’s digestive system sprout a lot faster than seeds that don’t, and they also have the added benefit of sprouting in a pile of elephant dung. Instant fertilizer! At least 14 species of tree need the elephant to eat their fruit in order for the seeds to sprout at all. If the forest elephant goes extinct, the trees will too.

Around 11,000 years ago, when the North American mammoths went extinct, something similar happened. Mammoths and other megafauna co-evolved with many plants and trees to disperse their seeds, and in return the animals got to eat some yummy fruit. But when the mammoths went extinct, many plants seeds couldn’t germinate since there were no mammoths to eat the fruit and poop out the seeds. Some of these plants survive but have declined severely, like the osage orange. It produces giant yellowish-green fruits that look like round greenish brains, and although it’s related to the mulberry, you wouldn’t be able to guess that from the fruit. Nothing much eats the fruit these days, but mammoths and other megafauna loved it. The osage orange mostly survives today because the plant can clone itself by sending up fresh sprouts from old roots.

Another plant that nearly went extinct after the mammoth did is a surprising one. Wild ancestors of modern North American squash plants relied on mammoths to disperse their seeds and create the type of habitat where the plants thrived. Mammoths probably behaved a lot like modern elephants, pulling down tree limbs to eat and sometimes pushing entire trees over. This disturbed land is what wild squash plants loved, and if you’ve ever prepared a pumpkin or squash you’ll know that it’s full of seeds. The wild ancestors of these modern cultivated plants didn’t have delicious fruits, though, at least not to human taste buds. The fruit contained toxins that made them bitter, which kept small animals from eating them, because the small animals would chew up the seeds instead of swallowing them whole. But the mammoths weren’t bothered by the toxins and in fact probably couldn’t even taste the bitterness. They thought these wild squash were delicious and they ate a lot of them.

After the mammoth went extinct, the wild squash lost its main seed disperser. As forests grew thicker after mammoths weren’t around to keep the trees open, the squash also lost a lot of its preferred habitat. The main reason why we have pumpkins and summer squash is because of our ancient ancestors. They bred for squash that weren’t bitter, and they planted them and cared for the plants. So even though the main cause of the mammoth’s extinction was probably overhunting by ancient humans, at least we got pumpkin pies out of the whole situation. I mean, I personally would prefer to have both pumpkin pie AND mammoths, but no one asked me.

World Elephant Day is on August 12, and this episode is going live in late March. That means you have a little over four months to get your elephant celebration plans ready!

You can find Strange Animals Podcast at strangeanimalspodcast.blubrry.net. That’s blueberry without any E’s. 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 Podchaser, or just tell a friend. We also have a Patreon at patreon.com/strangeanimalspodcast if you’d like to support us for as little as one dollar a month and get monthly bonus episodes.

Thanks for listening!

Episode 319: The Phascogale

Posted on by

Podcast: Play in new window | Download (Duration: 6:41 — 7.8MB)

Subscribe: RSS | More

Thanks to Kristie for suggesting this week’s topic, the phascogale!

Further reading:

Red-tailed phascogales (all photos below come from this site)

Sleeping phascogale:

Wide-awake phascogales:

Show transcript:

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

Ages ago, Kristie suggested I look up the phascogale, a really cute Australian animal. It’s definitely adorable and a little bit weird, so let’s learn about it this week!

Like most mammals that live in Australia, the phascogale is a marsupial. That means that the babies are born very early, then finish developing in their mother’s pouch. In this case, though, the phascogale mother doesn’t have a real pouch. Instead, when the mother is pregnant she develops what’s called a pseudo-pouch. Pseudo means false, so it’s not really a pouch although it resembles one. The pseudo-pouch is made up of folds of skin that develop around the mother’s teats, which protects the babies and keeps them warm. Since every baby needs its own teat at this stage, and the mother only has eight teats, if more than eight babies are born, the extra ones die.

The babies stay in the pseudo-pouch for about a month and a half, at which point they’re big enough that the mother can’t carry them around anymore. She makes a nest for them in a hollow tree, where they stay for another several months. She leaves them in the nest while she finds food, but comes back periodically to take care of them.

The phascogale is silvery-gray or gray-brown with a long tail that’s fluffy and black toward the end. It looks sort of like a mouse or rat with a long nose and a squirrel-like tail that’s almost as long as its body. It’s almost as big as a squirrel, up to about 10 inches long not including its tail, or 26 cm. Despite its resemblance to a rodent, the phascogale isn’t related to rodents at all. Rodents are placental mammals, not marsupial mammals.

The phascogale is nocturnal and mostly eats insects and spiders, but it will eat birds and mice too. It especially likes to eat cockroaches, yum. It mostly lives in trees although it will also hunt on the ground or in low brush, and it can jump long distances.

During the day the phascogale sleeps in a little hollow in a tree. It actually enters torpor while it’s asleep in order to save energy, which means it lowers its metabolic rate and its body temperature. But it can rev itself up again in only a few minutes when it needs to.

The strangest thing about the phascogale is that after mating season the males die. Mating season takes place over about three weeks in mid-winter, during which time a female may mate with several males. She’s able to store sperm in her body until she’s ready to have babies several months later, at which point she uses the stored sperm to fertilize her eggs. As a result, babies born in a single litter may have different fathers.

The males expend so much energy during these three weeks of mating season that they die of stress-related illnesses. In captivity, where the males can be treated by a veterinarian, a male who survives his first mating season can live as long as three years, but he doesn’t mate again. The female usually only has one litter of babies in her life even if she lives for several years.

The phascogale is closely related to the antechinus, which looks similar but has a skinny tail instead of a fluffy one. Antechinus males also die after mating season, while females give birth to tiny babies who latch onto a teat in the pseudo-pouch and stay there while they continue to develop, just like phascogales. Unlike phascogales, though, which always have eight teats, female antechinuses have different numbers of teats. How many teats a female has depends on where she lives. (Just a reminder, the word teats is another word for nipples.) Populations that live in areas where there’s plenty of food have more nipples, up to 13 but usually 12 at most. Populations that live in areas where it’s hard to find enough food have as few as 6 nipples. Producing milk for 12 or 13 babies requires a lot of energy, so females with more nipples can only survive and successfully raise that many babies when they have plenty of food. Females with only 6 nipples can survive on less food while still producing enough milk for six babies.

It seems strange that phascogale and antechinus males die after mating, but from an evolutionary standpoint, it makes sense. Both these animals are small and very likely to end up eaten by a larger animal. Odds are good that any given male won’t live long enough to see a second mating season anyway, so instead of conserving energy to stay alive, he expends all his energy during his first mating season to make sure he passes his genes along to the next generation.

One last interesting fact about the phascogale is that the red-tailed phascogale doesn’t need to drink water. It gets all the moisture it needs from its diet, which remember consists of insects and other animals. I guess animals are pretty moist on the inside. Don’t think about that too hard.

You can find Strange Animals Podcast at strangeanimalspodcast.blubrry.net. That’s blueberry without any E’s. 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 Podchaser, or just tell a friend. We also have a Patreon at patreon.com/strangeanimalspodcast if you’d like to support us for as little as one dollar a month and get monthly bonus episodes.

Thanks for listening!

Episode 318: The Mysterious Malagasy Hippo

Posted on by

Podcast: Play in new window | Download (Duration: 15:41 — 17.8MB)

Subscribe: RSS | More

Thanks to the Tracing Owls podcast for this week’s suggestion. I’m a guest on that podcast so make sure to check it out (but while my episode is appropriate for younger listeners, most episodes are not, so be warned).

Further reading:

Huge Hippos Roamed Britain One Million Years Ago

Kenyan fossils show evolution of hippos

The Kilopilopitsofy, Kidoky, and Bokyboky: Accounts of Strange Animals from Belo-sur-mer, Madagascar, and the Megafaunal “Extinction Window”

A sort-of Malagasy hippo:

Actual hippo (not from Madagascar, By Muhammad Mahdi Karim – Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=121282994):

A modern hippo skull. There’s a reason the hippo is more dangerous to humans than sharks are [By Raul654 – Darkened version of Image:Hippo skull.jpg, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=242785]:

A pygmy hippo and its calf!

Show transcript:

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

This week we’re going to learn about a topic suggested by the host of the podcast Tracing Owls, because I’m actually a guest on that podcast in an upcoming episode! I think the episode releases later this week. I’ll put a link in the show notes, but be aware that while the podcast is interesting and often very funny, with topics that focus on weird stuff related to science, most episodes are not appropriate for younger listeners. (I think my episode should be okay.)

Several years ago now there was a movie called Madagascar, which is about a group of zoo animals that end up shipwrecked on the island of Madagascar. I love this movie, especially the lemur King Julian, but one of my favorite characters is a hippopotamus named Gloria, voiced by Jada Pinkett Smith. The island country of Madagascar is off the southeastern coast of Africa, but as we talked about in episode 77, it’s been separated from the continent of Africa for millions of years and the animals of that country have mostly evolved separately from the animals of Africa. That’s part of why the movie Madagascar is so funny, since the main characters in the movie are all native to Africa—a lion, a zebra, a giraffe, and Gloria the hippo—and don’t know anything about the animals they encounter on Madagascar. Like this guy:

[King Julian clip]

But it turns out that hippos did once live on Madagascar, and that’s what we’re going to learn about today.

We’re not sure when the first humans visited Madagascar, but it was at least 2500 years ago and possibly as much as 9500 years ago or even earlier. By 1500 years ago people were definitely living on the island. It’s likely that hunting parties would travel to Madagascar and stay there for a while, then return home with lots of food, but eventually people decided it would be a nice place to live.

Madagascar is a really big island, the fourth largest island in the world. It’s been separated from every other landmass for around 88 million years, and has been separated from Africa for about 165 million years. Many of the animals and plants that live on Madagascar are very different from the ones living anywhere else in the world as a result.

To put this into perspective, here’s your reminder that the closest living relative of the hippopotamus is the whale, and 60 million years ago the common ancestor of both hippos and whales was a small semi-aquatic animal. That was about 28 million years after Madagascar was on its own in the big wide ocean, and 105 million years after the landmass that we call Africa broke off from the supercontinent Gondwana and began moving very slowly into the position it’s in today. When Madagascar finally broke free of the landmass we now call India, dinosaurs were still the dominant land animal.

So why are there remains of small hippos on Madagascar? How did the hippos get to Madagascar and why aren’t they still around? Did the hippo originate in Africa or in some other place? So many questions!

The ancestors of modern cetaceans, which includes whales and dolphins and their close relations, are found in the fossil record about 52 million years ago, although it might have been 53 or even 54 million years ago depending on which scientist you ask. That’s when the whale side of the suborder Whippomorpha started developing separately from the hippo side. The “morpha” part of Whippomorpha just means “resembling,” and I’m happy to report that the “whippo” part is actually a combination of the words whale and hippo. Truly, it gave me great joy when I learned this fact, because I assumed “whippo” was something in Greek or Latin, or maybe referred to an animal with a whip-like tail. Nope, whale+hippo=whippo.

Anyway, while we know a fair amount about the evolution of cetaceans from their semi-aquatic ancestors, we don’t know much at all about the hippo’s evolution. There’s still a lot of controversy about whether hippos really are all that closely related to whales after all. They share a lot of similarities both physically and genetically, so they’re definitely relations, but whether they’re close cousins is less certain. The confusion is mainly due to not having enough fossils of hippopotamus ancestors.

The modern hippo, the one we’re familiar with today, usually called the common hippo, first appears in the fossil record about six million years ago. We have fossils of animals that were pretty obviously close relations to the common hippo, if not direct ancestors, that date back about 20 million years. But it’s the gap between the hypothesized shared ancestor of both hippos and cetaceans that lived around 60 million years ago, and the first ancestral hippos 20 million years ago, that is such a mystery.

What we do know, though, is that while the common hippo is native to Africa, its ancestors weren’t. Hippo relations once lived throughout Europe and Asia, and probably migrated to Africa around 35 million years ago. In fact, hippos were common throughout Eurasia until relatively recent times. In 2021, a fossilized hippopotamus tooth was found in a cave in Somerset, England that probably lived only one million years ago. That was well before humans migrated into the area, which was a good thing for the humans because this hippo was humongous. It probably weighed around 3 tons, or 3200 kg, while the common hippo is about half that on average.

This particular huge hippo, Hippopotamus antiquus, lived throughout Europe and only went extinct around 550,000 years ago as far as we know. This was during a time that Europe was a lot warmer than it is today and hippos migrated north from the Mediterranean as far as southern England. The common hippo, H. amphibius, the one still around today, also migrated back into Eurasia during this warm period and its fossilized remains have been found in parts of England too.

These days, there are only two living species of hippo, the common hippo and the pygmy hippo. We talked about the pygmy hippo briefly in episode 135, including the astonishing fact that it only grows around 3 feet tall, or 90 cm, and lives in deep forests in parts of west Africa. There also used to be some other small hippos that evolved on islands and exhibited island dwarfism, and which probably weren’t closely related to the pygmy hippo. These include the Cretan dwarf hippopotamus that lived on the Greek island of Crete until around 300,000 years ago and maybe much more recently, and the Cyprus dwarf hippopotamus that lived on the island of Cyprus until only around 10,000 years ago. The Cyprus hippo was the smallest hippo found so far, only about 2.5 feet tall, or 75 cm. There are dogs larger than that! But the small hippo we’re interested in is the Malagasy pygmy hippopotamus.

There actually wasn’t just one hippo species that lived on Madagascar. Scientists have identified three species, although this may change as more studies take place and as new remains are found. The different species probably didn’t all live on the island at the same time, and some researchers think they might have resulted from three different migrations of hippos to the island.

But how did they get to the island? Madagascar is 250 miles away from Africa, or 400 km, way too far for a hippo to swim. The Malagasy hippos were well established on the island, too, not just a few individuals who accidentally reached shore. That means there must have been some way for hippos to reach Madagascar fairly easily at different times.

The best hypothesis right now is that at times when the ocean was overall shallower than it is now, such as during the Pleistocene glaciations, there are enough small islands between Africa and Madagascar that hippos could travel between them pretty easily. Since those islands would be far underwater now, we don’t have any way to know for sure. We can’t exactly dive down and look for hippo fossils, unfortunately.

The really big question, of course, is whether any hippos still survive on Madagascar. We know they were around as recently as 1,000 years ago, because we have subfossil remains. (Just a reminder that subfossil means that the remains are either not fossilized, or only partially fossilized.) Not only that, the bones show butchering marks so we know people killed and ate the hippos. Right now scientists think the hippos were hunted to extinction by the humans who settled on Madagascar, but there’s some evidence that it happened much more recently than 1,000 years ago.

Over the last several hundred years, European colonizers of Madagascar collected stories from Malagasy natives about animals that resemble hippos. More recently, some stories have also been collected by scientists.

In 1995, a biologist named David Burney, who was studying recently extinct animals on Madagascar, interviewed some elderly residents in various villages. He wasn’t actually trying to learn about mystery animals, he was mostly just trying to find the paleontological sites scientists had found decades before. He figured the older residents would remember those scientists’ visits, and he was right. But the residents also had other stories to tell about the bones dug up by scientists. Some of them said those bones belonged to animals they had seen alive.

In one village, several different people told a story about a cow-sized animal that had occasionally entered the village at night. It was dark in color and made distinctive grunting sounds, and had large floppy ears. When some people approached it too closely, it ran back to the water and submerged.

Dr. Burney thought the residents might have seen pictures of an elephant and transferred some of its details to the mystery animal, especially the large size and floppy ears. But when he showed a picture of an elephant to them, they were clear that it wasn’t the same animal. They chose a picture of a hippo instead, but said the animal they’d seen had larger ears. Various witnesses also said the animal had a large mouth with really big teeth, that its feet were flat, and that it was the size of a cow but didn’t have horns. One man even imitated the animal’s call, which Burney reported sounded like a hippopotamus even though the man had never seen or heard a hippo.

Burney was cautious about publishing his findings, and in fact in his article he mentions that even at the time, he and his team of scientists were cautious about even pursuing information about living Malagasy hippos. They didn’t want to be seen as acting like cryptozoologists, which says a lot about how cryptozoologists conduct their research. Cryptozoology isn’t a scientific field of study despite its name. Biologists, paleontologists, and other experts research mystery animals all the time. That’s just part of their job; they don’t have to call themselves something special. It’s unfortunately common that people who call themselves cryptozoologists don’t have a scientific background and may not know how to conduct proper field research. Very often, cryptozoologists also don’t know very much about the animals that definitely exist, and how can you determine what a true mystery animal is if you don’t know about non-mystery animals?

Luckily, Dr. Burney and his team decided to pursue this particular mystery animal, along with some others they learned about. The last hippo-like animal sighting they could pin to a particular date happened in 1976. If the animal in question was a hippo, and it really was alive only about 50 years ago, it might have gone extinct since then. Or it might still be alive and hiding deep in the forests of Madagascar.

You can find Strange Animals Podcast at strangeanimalspodcast.blubrry.net. That’s blueberry without any E’s. 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 Podchaser, or just tell a friend. We also have a Patreon at patreon.com/strangeanimalspodcast if you’d like to support us for as little as one dollar a month and get monthly bonus episodes.

Thanks for listening!

This is what a hippo sounds like, and you hear it all the time on this podcast because I like it:

[hippo sound]