Episode 506: The Beast of Buderim

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Photos of a mangy fox that make it look like it has stripes:

Show transcript:

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

Buderim is a small city in Queensland, Australia, right on the coast but extending up the side of a small mountain. It looks like an especially beautiful place in a beautiful part of the world, but in the 1990s it was in the news due to sightings of a strange animal.

The animal was dubbed the Beast of Buderim by reporters. It all seems to have started in 1993 when a local artist was driving with her husband and saw a striped animal run across the road. She thought for certain it was a Tasmanian tiger, more properly called a thylacine. When she got home, she drew what she’d seen. It looks like a foxlike animal with black stripes, a long whiskery muzzle, and a long thick tail.

In March of 1995 a local dentist and his ten-year-old daughter saw the animal while driving along the edge of the local rainforest one evening. It was dark but his headlights lit it up and he was able to give a good description of it. He said it was medium-sized, presumably meaning about the size of an average dog, and had stripes that were sort of like a tabby cat’s markings but somewhat like a brindled dog’s markings. He described its coat as goldy in color. He also said it had a pronounced bump above its eyes, although I’m not sure if he meant it had a bumped-up forehead or if he was referring to a brow ridge of some kind. The animal was standing on the road, but when the car approached, it arched its back and then ran into the trees.

Another sighting occurred in August of 1995, but not near Buderim. A man in Bundaberg, a city over 130 miles away from Buderim, or 210 km, was driving at night and had to brake hard to avoid hitting a gray kangaroo as it bounded across the road. A moment later a large animal leaped onto the road after the kangaroo. In the glare of the headlights, the man reported that the animal was sandy in color with stripes that started about halfway down its back, and that its eyes glowed green-yellow. It was big too, four or five feet long, or 1.2 to 1.5 meters, not even counting its long, thick tail. It also had long jaws that the man said reminded him of a crocodile’s when it snarled at him. It made another huge leap and disappeared into the brush.

Plenty of other sightings have been reported from around Buderim and other parts of Queensland, with the most recent in 2014 turning out to be a mangy fox. This is the same area where a different striped animal, usually called the Queensland tiger, was first reported in 1871 and occasionally spotted afterwards. Sometimes people confuse the Beast of Buderim and the Queensland tiger. We talked about the Queensland tiger in an episode a long time ago—I don’t remember which one, but I do remember there not being much evidence that it was a real animal.

Some people think the Queensland tiger is a descendant of an extinct animal called Thylacoleo [thyla-CO-leo], while the Beast of Buderim is supposed to be a thylacine.

Thylacoleo is sometimes called the marsupial lion, although it looked much different than a lion. It had a strong kangaroo-like tail that it could use as a balance to help it stand on its hind legs. Its front legs were extremely strong and it actually had a semi-opposable thumb that helped it grab onto prey. Its front claws were retractable like a cat’s claws too, an excellent example of convergent evolution. All these traits also meant that Thylacoleo could climb extremely well. It might not have been a very fast runner, though, and some researchers think it was an ambush predator, possibly dropping down from trees onto its prey. The largest species, Thylacoleo carnifex, stood over two feet tall at the shoulder, or 71 cm, and was heavy for its size.

Not only that, Thylacoleo had massive jaws with huge weird teeth. Its cheek teeth were enormous, basically just one giant tooth on each side. Its other teeth were much smaller in comparison and not very strong, but those giant cheek teeth and its strong jaws meant that Thylacoleo could bite right through meat and bones with no problem.

We don’t know for sure what Thylacoleo looked like, but we do have two separate pieces of rock art that probably depict it. They show it with pointed ears instead of rounded ones and stripes on its back.

Thylacoleo was an apex predator in the food web of Australian megafauna during the Pleistocene, and like many of the megafauna predators in other parts of the world, Thylacoleo required giant prey. When its prey started to go extinct due to climate change toward the end of the ice age, along with the arrival of humans who hunted megafauna efficiently, eventually Thylacoleo didn’t have anything to eat. It was too well adapted for killing large prey to switch over to smaller prey, and more nimble small predators out-competed it. We’re not sure when it went extinct, but the best guess right now is about 30,000 years ago and possibly 40,000 years ago. It’s definitely not alive today, no matter how awesome that would be.

But that’s all beside the point, because most people who have reported sightings of the Beast of Buderim say it looks like a thylacine. We talked about the thylacine in episode one and then I’ve hardly mentioned it, so let’s learn a bit about it now.

Unlike Thylacoleo, the thylacine went extinct less than a century ago, and we know exactly what it looked like, where it lived, and why it went extinct. We have photographs and even video of living thylacines kept in captivity. The last thylacine reported in the wild was shot and killed in 1930, while the last captive specimen died in 1936. People have reported sightings since, but no definitive proof of a living thylacine has been found despite lots of people searching for it. It was officially declared extinct in 1982.

The thylacine looked superficially like a canid and was about the size of a big dog, with a long body and long, somewhat cat-like tail although the tail was stiff, not flexible like a cat’s. The thylacine was tan or brown in color with darker stripes that started just behind the shoulders and continued down the hindquarters and down the tail. It had large, somewhat rounded ears, a long muzzle, and jaws that could open extremely wide.

The thylacine looks like it should be a scary animal, and European settlers certainly acted like it was a monster that killed sheep and other large livestock. In reality, though, it was a timid animal with weak jaws that mostly ate small animals like a flightless bird called the Tasmanian native hen. It would definitely kill domestic chickens but it certainly wasn’t killing sheep. It also couldn’t run very fast, although it could stand on its hind legs for short periods of time.

That didn’t stop the Tasmanian government from offering a bounty for dead thylacines. Bounties started as early as 1830 and a century later the thylacine was extinct. Hunting was only part of the problem, though. Habitat loss was an increasing issue as more and more wild land was converted to farmland, and introduced predators like foxes and dogs competed for food and sometimes killed the thylacine. The thylacine’s preferred prey was also declining in numbers for the same reasons. As if that wasn’t bad enough, a disease similar to distemper decimated wild and captive thylacines, possibly because the remaining population was weakened by a lack of genetic diversity.

One interesting thing about the thylacine is that both males and females had a pouch. Like other marsupials, the female’s pouch was where her babies finished developing after they were born. Her pouch was under her tail and opened toward the rear of the body, as in wombats, which is somewhat rare. It contained four teats. The male’s pouch was in the same place and is called a scrotal pouch. The male could withdraw his scrotum into the pouch to protect it when he was traveling through tall brush.

The thylacine only survived in Tasmania until its recent extinction. It had once been common in mainland Australia too but probably went extinct there at least 2,000 years ago and probably closer to 3,000 years ago. There’s no conclusive proof that it survived in Australia until modern times and no conclusive proof that it lives there now. But Queensland is in Australia and that’s where the beast of Buderim has been sighted. Could the beast be a relict population of thylacines?

The August 1995 sighting at first seems plausible, since it’s so detailed and the description matches the thylacine. But remember, the thylacine wasn’t a very fast animal, mostly ate quite small prey like birds the size of chickens, and didn’t seem to be very aggressive. It certainly wouldn’t be chasing a full-grown male gray kangaroo, as the witness reported. The eastern gray kangaroo is a large, muscular animal that can bound extremely quickly, up to 40 mph, or 64 km/hour, and has sharp claws on its hind feet. A male can stand 6 ½ feet tall, or almost 2 meters.

Aside from humans, the gray kangaroo’s only living predator is the dingo, a canid introduced to Australia by humans over 8,000 years ago. We talked about it in episode 232. The dingo is usually tan or reddish in color and it carries its tail low, not curved upward. It also has pointed ears.

It doesn’t have stripes, though, and the stripes are a common detail in all the beast of Buderim sightings. But there are a number of possible solutions that don’t involve thylacines. The dentist’s sighting from 1995 might easily have been a big domestic cat. The dentist even reported that it had tabby-cat markings and that it arched its back when it saw the car. Size can be hard to estimate in darkness, especially when you’ve seen something unexpected.

The artist’s sighting in 1993 is less detailed. We have her drawing of the animal but we don’t know whether she saw it in daytime or at night. She saw it run across the road, which means that even if it was broad daylight she probably didn’t get a great look at it. I suspect a lot of the details she included in her drawing were things she expected to see, not things she actually necessarily saw. That doesn’t mean she was lying, just that her brain was filling in details without her even being aware of it. I think she saw a fox.

As for the August 1995 sighting, where the animal was chasing a kangaroo, I think that witness saw a dingo.

But wait, you may be thinking, neither foxes nor dingos have stripes! We’ve established their lack of stripes already.

To solve the mystery of the stripes, we have to look at another reported sighting. This is the most recent one, from 2014. The animal in question turned out to be a mangy fox, but it also definitely looked like it had stripes. We know because the witness got photographs, and the photographs show a scruffy fox with a thin tail and what look like thin dark stripes along its sides. All the beast of Buderum witnesses described their animals as looking brindled, and the marking known as brindled in dogs and a few other animals consist of thin dark stripes that are fairly close together.

Many things can make an animal look like it has brindled stripes, including poor coat quality, a coat that’s damp from rain or fog, or a coat that’s so thick it’s almost quilted and is therefore likely to appear unusual in bright headlights. The August 1995 sighting happened in wintertime in Australia, when a dingo might be expected to have a thick undercoat.

Whatever the animals were that witnesses reported, I don’t think they saw thylacines. That doesn’t necessarily mean they didn’t see something mysterious, though. There might be some rare striped animal in Queensland that gets seen occasionally and mistaken for a thylacine. It’s just much more likely that foxes, dingoes, and other known animals are the actual Beast of Buderim. But I would love to be proven wrong!

Thanks for your support, and thanks for listening!

Episode 505: Three Animal Mysteries

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Further reading:

Scientists solve a shark murder mystery

Stone Age Animal Urine Could Solve a Mystery about Technological Development

South African rock art possibly inspired by long-extinct species

The porbeagle shark [photo by Andy Murch, taken from this site]:

Dicynodont fossils and their possible art interpretation by the San people:

Show transcript:

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

It’s finally monster month, and I’m looking forward to sharing lots of fun mystery animals and animal mysteries over the next four weeks.

Our first mystery is from an article titled “Scientists solve a shark murder mystery.” The word solve is doing a lot of heavy lifting in this case, but let’s find out what happened to the shark.

The shark in question was a porbeagle shark, a type of mackerel shark that can grow as much as 12 feet long, or over 3.5 meters, and is gray and white in color. It lives in cold water in the North Atlantic and around Antarctica, and it eats fish and cephalopods like squid. It hardly ever bothers people although people like to eat it, and in some regions it’s been so overfished that the species is listed as endangered.

The porbeagle is especially unusual because it’s able to thermoregulate to some degree, like the basking shark and some other sharks that we talked about in episode 353, about warm-blooded fish. The porbeagle is actually really good at keeping its brain, eyes, and internal organs warm, which is why it’s so successful in cold water. It can live to be at least 65 years old.

There’s still a lot we don’t know about the porbeagle, including where exactly it lives and how far it migrates throughout the year. A team of scientists has been tagging porbeagle sharks with little transmitters, like shark Air Tags, to find out where the sharks travel and other information, like how deeply they dive and what the water temperature is. The transmitter is attached to a shark’s fin and is designed to stay in place for a year, then detach and transmit all the information it’s gathered as soon as it floats to the water’s surface.

In October 2020, the scientists captured an 8-foot, or 2.5 meter, female porbeagle and fitted her with a transmitter before releasing her again. They were especially happy to see that she was pregnant, partly because the porbeagle is endangered and reproduces slowly, partly because they were interested to find out where a pregnant shark traveled.

About six months later, in April 2021, the tag began to transmit its information. It was too early for it to have detached on its own, but sometimes something happens to a tag and it ends up removed from the shark before it’s scheduled to.

The team’s lead scientist, Brooke Anderson, examined the transmitter’s information and knew something weird had happened to the shark. Everything seemed normal until about a week before the tag began to transmit, when the tag indicated a slight but steady increase in the temperature of its surroundings, even though it was still deep underwater. Anderson suspected that the shark had been killed and eaten at that point, and the tag ended up inside the body of another animal that was able to thermoregulate. When the transmitter was expelled from the predator’s body, it floated to the surface and did what it was designed to do, transmit its saved information.

But while the porbeagle isn’t a huge shark, it’s still big and dangerous. It’s also a fast swimmer. Something really big had to have attacked the shark.

The first thing Anderson suspected was an orca, but she and her team immediately rejected that theory. Orcas are mammals, which means an orca’s internal temperature is much higher than the tag had recorded. That narrowed the suspects down to another shark that’s able to thermoregulate, but it also had to be a really big shark. They decided in the end that the porbeagle was probably eaten by a great white.

Next, we need to learn a little about the rock hyrax, because a deposit of ancient rock hyrax urine is helping scientists learn more about our own prehistoric ancestors.

The rock hyrax looks like a weird rodent but it’s actually more closely related to dugongs, manatees, and elephants. I’m literally not even kidding. Hyraxes are native to Africa although the rock hyrax also lives in parts of the Middle East. It’s also called the dassie. It’s a chonky animal with a short tail and thick fur, small rounded ears, and nails instead of claws. Even a big male rock hyrax grows less than two feet long, or 50 cm, about the size of a small marmot or groundhog, which it resembles superficially. It eats plants.

The rock hyrax lives in family groups of one male and several females, along with their young offspring. It doesn’t dig a burrow but lives in holes and shelters it finds already dug, including caves, and that brings us to the sort-of mystery.

Like many animals, the rock hyrax tends to pee in the same place every time it needs to go, and a group of hyraxes living in the same shelter tend to all pee in the same place. A good shelter, like a cave, will get used by generation after generation of hyraxes. The rock hyrax is well adapted to dry areas and its kidneys are efficient. It doesn’t need a lot of water. As a result, its urine tends to be fairly thick and it also hardens quickly when exposed to the air.

In other words: rock hyraxes have been peeing in one part of Boomplaas Cave in South Africa for at least 50,000 years, and that urine is preserved in thin layers that contain pollen and other clues about the climate over the last 50 millennia. The urine can be carbon dated, too. That means scientists can cut samples from that huge deposit of ancient urine, determine how old each layer is, and examine the pollen trapped inside to learn what kind of plants were growing in the area at the time. That helps them determine what the climate was like, which in turn helps them learn more about the ancient humans who lived in the area too.

Until the samples were tested in 2022, the changes in South Africa’s climate over the last 50,000 years wasn’t well known. Now we have an unbroken record of the climate. The main problem is that the urine smells really, really bad. Like, really really bad. But it’s worth it, for science.

Let’s finish with another mystery from South Africa. Around 200 years ago, between 1821 and 1835, some artists among the San people painted an interesting animal on a rock wall. It’s not the only part of the painting, which contains art of other animals and various cultural elements, but it’s the only animal that can’t be identified as something real.

Of course, you can’t study art the same way you’d study a fossil. If you draw a dragon from your imagination, that’s art. If a scientist comes along 200 years later and tries to claim that dragon was based on a real animal that had four legs and two wings and could breathe fire, they’re misunderstanding what art is. But if that same scientist looked at your drawing along with the journal you kept at the same time telling about how you visited the zoo, they might suggest that your drawing was inspired by the crocodiles and monitor lizards you saw.

That’s what Julien Benoit thinks about the painting of an animal referred to as the horned serpent. The San have lived in that particular part of South Africa for longer than hyraxes have been peeing in Boomplaas Cave, and their culture is rich and in many ways unchanged from that of their ancient ancestors. They know everything about their land, including all the animals that live there now and a lot that used to live there.

The horned serpent painting is a long-bodied animal that doesn’t actually look like a serpent or an animal with horns. It very clearly has legs even though they’re short, and its body is thick but with a long thin tail and a small head with downward pointing tusks. If the animal was painted near somewhere that you’d expect to find walruses, everyone would assume it’s a walrus. But it’s not a walrus, or probably not, and the painting doesn’t resemble anything that actually lives in South Africa.

However, Benoit suggests that it does resemble an animal that used to live in what is now South Africa, the dicynodont. It had downward-pointing tusks, a thick body, and fairly short, strong legs. It ate plants and was very common in the area when it was alive—but it went extinct over 200 million years ago.

Clearly, as ancient as the San culture is, they weren’t around in the Triassic, so how could they possibly have known about dicynodonts? The answer is pretty simple. Dicynodonts were so common that their fossils are regularly found in the Karoo Basin of South Africa, including well-preserved skulls eroding out of the ground.

The San would have undoubtedly come across these fossils. They even have myths about huge animals that once roamed the area but that died out long ago, and archaeologists have found collections of fossils made by the San centuries ago. Benoit thinks the so-called horned serpent is an artistic depiction of a dicynodont, with elements taken from the fossils and from myth.

In other words, basically, the San people understood paleontology and extinction long before Europeans figured it out.

Thanks for your support, and thanks for listening!

Episode 504: The Mystery Roar

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Further reading:

Wolves on rise in France as bears wreak mountain havoc

Can Brown Bears Survive in the Pyrenees?

Show transcript:

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

On the evening of August 4, 2019, two hikers set up camp in the Pyrenees Mountains. Laurent and Frédéric were familiar with the area and had plenty of experience hiking and camping. Once their camp was ready for the night, they took off their boots and socks and sat down to eat dinner and relax at a small campfire. If you’ve ever camped after a long hike, you’ll know that this is the best time of the day, when you can rest and air out your boots.

After only a few minutes, though, the two heard grunts and growls in the darkness not far from their camp. They were concerned, but they had a fire and most animals won’t approach a fire. But the sounds got closer and closer.

Then the animal roared—and it sounded like it was much closer than before. Laurent and Frédéric remembered that bears have become more common in the Pyrenees in the last few decades, and rather than take their chances with a hungry bear, they decided it was time to go. They shoved their bare feet into their boots, left everything behind, and raced back down the trail.

It was late when they made it to the village of Germ so the hikers took refuge in a church where they spent the night. In the morning they hiked back up to their campsite to retrieve their belongings, expecting it to be trashed by a bear hunting for food. But everything was where they’d left it.

Some people assumed the hikers had panicked over nothing, but the men were adamant that they’d heard something roaring as it came closer. In a news interview they said the final roar, the one that made them grab their boots and run, lasted several seconds and was so loud they could actually feel it in their chests.

Brown bears were once fairly common in the Pyrenees but by 1991 they had all been killed, mostly by hunters. Habitat loss was also a factor as people built more roads and houses in the mountains. In 1995 a conservation program brought three bears from Slovenia to start a reintroduction program, and the way people acted, you’d think someone had released a thousand rabid weasels into their homes.

Sheep and cattle farmers, and people who think the wilderness belongs to humans and humans only, protested the reintroduction of the bears, and one of the bears was shot and killed. This is despite the fact that farmers whose livestock are killed by bears get paid a lot of money by the French government. Approximately 1,000 sheep a year are killed in the Pyrenees—not by bears, but by pet dogs running loose.

Conservation efforts continued despite protests and finally, by 2020, there were 64 bears living in the Pyrenees Mountains. The number may be a little larger—some estimates are as high as 100—but conservationists have difficulty counting the bears properly because protesters threaten them and in one case actually set a conservationist’s car on fire.

The Pyrenees mountain range more or less divides France from Spain. It’s older than the Alps and especially known for its spectacular waterfalls. Many plants and animals that live in the Pyrenees are found nowhere else in the world, but unfortunately hunting and habitat loss have driven many of them to extinction. The Pyrenean ibex, a type of wild goat, went extinct in the year 2000.

Conservationists have introduced a related animal, the western Spanish ibex, to help keep the mountain ecosystems healthy. The bears now living in the mountains are similarly important to the ecosystems. Conservationists are frustrated by protesters who don’t want bears in the mountains at all, especially considering that the Great Pyrenees dog was developed in the area to protect livestock from bears and other predators. Some shepherds in British Columbia, Canada, where both black bears and grizzlies live, successfully use Great Pyrenees dogs to guard their flocks from bears. Grizzlies are a subspecies of brown bear.

But let’s go back to Laurent and Frédéric’s scary camping trip. Did they really encounter a bear or could it be something else?

Bears are generally quite shy animals who avoid people when they can. Unlike black bears, which don’t growl, brown bears do make growling and grunting sounds occasionally. Males will growl or even roar at other males during mating season in spring and early summer, signaling aggression and the willingness to fight. A brown bear will sometimes growl or roar at a person to warn them away too. So it’s possible the hikers heard a bear who wasn’t interested in their food but just wanted them out of its territory.

There’s another possibility, though, and it’s an animal that’s much more common in the Pyrenees Mountains than bears are. The wild boar lives throughout the Pyrenees, especially in forested areas and meadows. It’s mostly nocturnal and is usually shy of humans, and its numbers have increased considerably since its main predator, the wolf, was driven to extinction in the mountains and elsewhere in the 1930s.

An estimated two million wild boars live in France, including the Pyrenees. The most common time for people to encounter wild boars is at dusk, which is exactly when the hikers heard the growling. But wild boars are just pigs, right? Pigs oink, right?

This is what an aggressive wild boar sounds like:

[boar growl]

A boar will growl to warn other boars that there’s danger nearby and to signal aggression. That would explain why the hikers heard grunts and growls, which finished in a loud, angry roar. It would also explain why the campsite was undisturbed. Wild boars mostly eat plants, including roots, nuts, and fruit, although they’ll also eat carrion and the occasional small animal if they can catch it. Unlike a bear, which almost always wants to eat people food when it can, a wild boar is a lot less interested in people food. If the hikers did hear a boar instead of a bear, once they ran away the boar was probably satisfied and just went around finding its natural food in the area as usual.

Wild boars have been introduced to parts of North and South America, Australia, and other places where they’ve become an invasive species. The wild boar is native to Europe and Asia, though, so the ones in the Pyrenees are right where they belong. The only real issue is the lack of natural predators to keep the boar population at a healthy level.

The good news is that wild boars aren’t usually as aggressive as they can sound, as long as they’re not cornered. The two hikers were probably not in any danger after all. Still, it’s better to be safe than sorry when you get roared at by a large creature in the dark.

Thanks for your support and thanks for listening!

Episode 503: The Mystery of Typhloesus

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Further reading:

A possible home for a bizarre Carboniferous animal: is Typhloesus a pelagic gastropod?

Typhloesus

An artist’s rendition of what Typhloesus might have looked like [pic taken from the Nix Illustration link above]:

Show transcript:

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

I recently discovered the excellent Nix Illustration blog, which is about scientific illustration and palaeontology. I’m finding so many fun topics that I keep going back to it, so I hope you don’t mind another invertebrate mystery I learned about from the site. There are links in the show notes if you want to read the original blog posts.

This month’s mystery is Typhloesus wellsi, sometimes referred to as the “alien goldfish” because of its shape and its peculiar anatomy. It definitely wasn’t a fish. It lived around 324 million years ago and was first discovered in the early 1970s in Montana, in the middle of North America. It grew up to four inches long, or 10 cm, and was shaped not like a real goldfish but kind of like a goldfish cracker. Its body was roughly cylinder-shaped, and it had a vertical tail fin and a pair of fin-like lobes on its sides that are referred to as keels. But it didn’t have eyes or, as far as scientists can determine, an anus. It did have a mouth and gut cavity–but it also had something truly unexpected and mysterious in its body, a pair of disc-shaped organs that contained a lot of iron but whose function is completely unknown and unlike anything scientists have ever seen.

Those initial specimens also contained lots of conodont teeth, which led scientists to hope they’d finally discovered the conodont animal. We’ve talked about conodont teeth before, but it’s been quite a while ago. Conodont animals were incredibly common for around 300 million years, and their teeth are found throughout the world. Technically they’re not teeth but tooth-like structures called conodont elements, some of them microscopic, some of them almost an inch long, or 2 cm. Each animal had three types of conodont elements, and they interacted in a way that we don’t fully understand since they were completely different from modern animal mouthparts.

Until the 1980s, no one knew what the conodont animal looked like. The only fossils we had were the tiny teeth. Then some body impressions of the conodont animal were discovered. Now we know it was shaped like an eel and grew up to 20 inches long, or 50 cm. We also know it had large eyes, a notochord (or primitive spine), and fins on the tail end. It was probably related to hagfish and lampreys and may have looked similar, although not everyone agrees with this classification.

Whatever the conodont animal was related to, Typhloesus definitely wasn’t one. It turns out that the conodont teeth associated with Typhloesus fossils were actually in its gut, after the alien goldfish ate a conodont animal.

So scientists were back to square one. What was Typhloesus?

In 2022, a study of several specimens revealed a clue. Typhloesus had a radula. That’s a mouthpart that resembles a tooth-studded tongue. Snails, for instance, use tiny radulas to scrape algae and other food off of rocks. True radulas are a trait of mollusks, which means Typhloesus was most likely an early mollusk, maybe even a gastropod like snails and slugs.

That’s a start to classifying Typhloesus, but it doesn’t explain the pair of weird disc-shaped organs. It’s called a ferrodiscus and we still don’t know what it was for. Because of its placement just under the midgut and its high concentration of iron, which would have made it quite hard in comparison to most of the rest of its body, the ferrodiscus might have had something to do with digestion. Then again, it might have had something to do with chemoreception, which is probably how Typhloesus found its food. Some modern mollusks have a chemoreceptor organ under the radula, but it’s mainly a bundle of nerve cells and not any kind of weird iron discs. We just don’t know what the ferrodiscus was.

Typhloesus probably swam around until it encountered a small animal like a conodont, and then it would stick its radula out like a spiky tongue and use it to grab the animal. Typhloesus had no anus, so after it digested its meal it just spat out the indigestible parts. It might also have been a scavenger that used its radula to pull pieces off of a dead animal to eat.

Not every scientist agrees that Typhloesus was a mollusk. Only mollusks have true radulas, although not all mollusks have them, but other animals have evolved similar structures. Typhloesus is so different from known mollusks, living and extinct, that scientists can’t definitively determine what it was related to. It had no gills and no notochord, so we know it had to be an invertebrate. Some cnidarians, which include jellyfish and sea anemones, have no anus, but Typhloesus has even less in common with that phylum of animals than it has with mollusks. Some flatworms have no anus, but again, Typhloesus doesn’t seem to have a lot of other traits in common with flatworms.

Until we learn more about it from studying well-preserved fossils, we can only speculate about where Typhloesus fits in the tree of life and what the ferrodiscus actually was. Mysteries like this are part of the challenge of science, and part of the fun too.

Thanks for your support, and thanks for listening!

Episode 502: Back to the Ocean

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Show transcript:

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

Life arose in the oceans and only much later spread to the land. But some land animals returned to the ocean and eventually became fully marine animals. That’s our topic this month, animals that returned to the sea.

Vertebrates that evolved on land are called tetrapods, meaning four-footed. It applies even to animals like birds that have two legs and two wings, and snakes that have no legs, because all the ancestors of tetrapods had four legs.

Returning to marine life as a tetrapod eventually results in an animal developing certain characteristics. Even animals like sea turtles become more streamlined, which helps the animal swim more easily, and arms and legs develop into flippers for the same reason. Sometimes limbs are lost completely, like the rear legs of cetaceans and sirenians, because they’re not needed. One interesting note is that as far as we know, all marine tetrapods still have to breathe air, which requires them to come to the surface of the water periodically.

The ancestors of marine tetrapods probably all started out as partially aquatic and gradually became more and more at home in the water. That’s true even for animals as well adapted to marine life as whales.

Some of the earliest whale ancestors were the ambulocetids, which probably looked sort of like a cross between a hippopotamus and a crocodile. Ambulocetid means “walking whale,” but there’s some evidence that it might have already evolved to be fully aquatic 49 million years ago. It had short legs that might not have been strong enough to support it out of water. It might have been covered with short fur like a seal but it might have had little to no fur, more like a hippopotamus. Either way, it had long toothy jaws, strong legs with webbed toes that it used to propel itself through the water, and a tail that probably resembled that of an otter. It grew about ten feet long, or 3 meters.

Ambulocetids lived in shallow coastal areas where the land was swampy, and it may have spent part of its time in fresh water. It wouldn’t have looked or acted much like a whale to us, but it was already developing features now found only in whales.

By around 41 million years ago, the basilosaurids and their close relations had evolved, and were definitely fully aquatic. Their nostrils had moved almost to the location of modern whales’ blowholes. Their forelegs were basically flippers with little fingers, their hind legs had almost disappeared, and they had tail flukes. They were also much bigger than their ancestors. Basilosaurus could grow up to 60 feet long, or 18 meters, and probably looked more like a gigantic eel than a modern whale. It was long and relatively thin, and may have mostly lived at the ocean’s surface instead of diving for food.

Dakosaurus wasn’t a dinosaur despite its name, although it lived at the same time as the dinosaurs, about 145 million years ago. It was a crocodylomorph that grew up to about 16 feet long, or 5 meters, and looked kind of like a shark with legs—but also a lot like a crocodile wearing a shark costume. Its tail had a fin near the end that made it resemble a shark’s tail, and its legs were flipper-like but still obviously legs. It had a whole lot of big serrated teeth in a deep skull with strong jaws. Because its jaws and teeth were so strong, in fact, scientists think Dakosaurus probably ate other marine reptiles instead of just fish.

While Dakosaurus was streamlined and well adapted to life in the ocean, we don’t know if it left the water to lay its eggs on land the way sea turtles still do or if it gave birth in the water. We don’t have any nest sites or young specimens one way or another.

Other marine reptiles definitely gave birth in the water, including ichthyosaurs. Ichthyosaurs and their close relations were incredibly successful, first appearing in the fossil record around 250 million years ago and last appearing around 90 million years ago. Most ichthyosaurs grew around 6 and a half to 11 feet long, or 2 to 3.3 meters, depending on species, so while they were pretty big animals, they weren’t enormous. They would have been fast, though, and looked a lot like fish or dolphins, with four flippers, a dorsal fin, a long tail with fins, and a long thin rostrum with lots of little teeth. We know they gave birth to live young because we have fossils of female ichthyosaurs who died in the process of giving birth, with the baby’s tail outside of its mother but the rest of it still in the birth canal. We have other fossils of ichthyosaurs with partially developed young in what would have been the mother’s uterus.

We also have lots of ichthyosaur coprolites that show us what it ate, since the coprolites fossilized with pieces of undigested food in them. This includes fish scales and squid beaks.

Of course, if you want to talk about big marine reptiles, you have to talk about mosasaurs. They lived in the late Cretaceous and went extinct at the same time as the non-avian dinosaurs. The earlier species of mosasaur are pretty small, but after ichthyosaurs went extinct, mosasaurs got really really big. Some estimates for the largest species range up to almost 50 feet long, or 15 meters, and maybe even longer. Mosasaurs looked kind of like streamlined iguanas, with four flippers, a shark-like tail, but a very lizard-like head. They probably ate other marine reptiles, including smaller species of mosasaur, along with sharks and other fish, dinosaurs that made the mistake of getting in the water, and sea turtles. Honestly, mosasaurs could eat whatever they could catch, and they could probably catch just about anything. Their jaws were double-hinged, which allowed them to swallow prey whole like snakes do.

We even have some skin impressions of mosasaurs that show smooth scales similar to those of snakes, and one study suggests that mosasaurs might have had forked tongues too. Mosasaurs were distantly related to snakes, but they were more closely related to monitor lizards that also have forked tongues.

Speaking of snakes, we’ll finish with an animal that people don’t usually remember when they think of animals that have returned to the ocean: sea snakes.

Not all sea snakes are fully marine. One genus spends part of its time on land and still lays eggs, but fully marine sea snakes give birth to live young. Researchers aren’t sure if the sea snakes that are fully marine were able to completely stop returning to the land because they already gave birth to live young or if that developed after the snakes started spending part of the time in the water.

The sea snake has a single lung, like most snakes, but unlike snakes that live on land this lung extends almost the length of the whole body (but not the tail). The snake’s nostrils are at the top of its snout so it can breathe without sticking too much of its head above water, and its extra-long lung can store lots of air so the snake doesn’t have to breathe too often. Some sea snakes can stay underwater for up to about two hours, partly because of the air stored in the lung, but also because they can absorb some oxygen from the water through their skin. Studies have shown that a sea snake can absorb almost 25% of the oxygen it needs through its skin.

Sea snakes are pretty big, with the largest growing up to 10 feet long, or 3 meters. Most are about half that length. They live in warm tropical oceans, usually in shallow water, and eat fish and other small animals. The sea snake’s body is slightly flattened side to side and its tail is much more flattened like a paddle, which is how it swims. In most cases, if a sea snake is washed ashore, it’s unable to crawl and is pretty much helpless. Terrestrial snakes have enlarged ventral scales that the snake can move up and down, allowing the edges of the scales to grab dirt or leaves or whatever the snake is moving over. This gives it a purchase, and as the scales move they push the body forward. Most sea snakes don’t have these specialized ventral scales and have regular smooth scales instead.

But while most sea snakes can’t move on land, if you see one stranded, don’t try to pick it up to help it. All sea snakes are extremely venomous. (Use a long paddle to push the sea snake back into the water, or better yet, call an expert who can safely return the snake to the water.) Most sea snakes are brightly colored as a result, to warn potential predators away. Many have stripes and are absolutely gorgeous.

Generally, if you encounter a sea snake while you’re swimming, the snake isn’t going to bite you. You’re too big for it to swallow and it doesn’t want to waste its venom on you. Don’t bother it and it won’t bother you unless it feels threatened. Just swim calmly away and be glad it’s not a mosasaur.

Thanks for your support, and thanks for listening!

Episode 501: The Wee Waa Monster and Tupandactylus

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Further reading:

Pterosaur melanosomes support signalling functions for early feathers

Show transcript:

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

This month we have a small mystery from Australia, which as far as I can find is still unsolved.

In 1950, a man named George Gray started hearing bellowing from the gum swamp near his house. His adult son, Ted, heard it too and reported it was loud enough to hear half a mile away, or about 800 meters.

The bellowing sounded like a crocodile. The problem is, the Grays lived just outside of the small town of Wee Waa in New South Wales, Australia. Very, very rarely a saltwater crocodile wanders down the coast as far as New South Wales, but Wee Waa is a five or six hour drive inland. It’s not crocodile country. It gets cold in winter and it’s surrounded by farmland.

Ted Gray found tracks in the swamp where a large animal had flattened tall grass, although the footprints didn’t have claw marks. He estimated that if the animal was a crocodile, it was only about 6 feet long, or 1.8 meters, although he did note that none of the trails seemed to lead to the water. The bellowing mostly occurred in early morning and around sundown and continued for several months.

Attempts to search the wetlands were unsuccessful, mostly because of heavy rain that spring and summer. The water was ordinarily no more than 3 feet deep, or about a meter [actually about 92 cm, got this wrong], but was much deeper that year. Hundreds of people came to listen to the bellowing, though, and one constable perched in a tree for most of a day hoping to shoot the animal. He never saw it.

Seven years earlier, during World War II, an armored division of troops stayed in the area. The troops had been based in northwest Australia for a time and were supposed to have brought some baby crocodiles with them as mascots. The soldiers were told to kill the crocodiles, but newspapers in 1950 suggested they’d been released instead and that one had found its way to George Gray’s swamp. That doesn’t explain how it survived seven winters or why no one had seen or heard it until then.

Then again, one man named Ross Tuckey claimed he’d seen a crocodile several years before about 20 miles away, or 32 kilometers. He’d first thought it was a goanna, which is a type of monitor lizard that lives in Australia. Some species of goanna can grow more than 8 feet long, or about 2.5 meters. When Tuckey’s dog rushed at the animal, it bowled the dog away with its tail and slid into a dammed stream. Tuckey watched it float in the water with only its nostrils visible.

The Wee Waa monster was never identified.

That’s all there is! I tried to find out more but if anyone ever found what animal was bellowing in George Gray’s swamp, the newspapers didn’t report about it. I actually only learned about this animal mystery when I was searching for something else, which is always a lot of fun.

***

115 million years ago a colony of strange flying animals lived in what is now northeastern Brazil in South America. It was a reptile that lived at the same time as dinosaurs, but it wasn’t a dinosaur. It wasn’t a bird either. Its wingspan might have been as much as 13 feet across, or 4 meters, which was big for a pterosaur, which of course is what it was. Specifically, it’s Tupandactylus imperator [too-pan-DAK-tillus imper-AH-ter], and it is a complete weirdo.

Tupandactylus was only described in 1997, but we have several really well preserved specimens, including nearly complete skulls. And it’s the skull that makes it so bizarre. Many pterosaurs had large crests that were probably brightly colored and probably used to attract mates, but Tupandactylus had what may be the largest crest ever found. It was just ridiculously large, nearly as big as its whole body, not counting its wings, of course.

Tupandactylus’s skull is hard to describe. I’m going to do my best, but you might want to click through to the show notes and look at the picture.

First, imagine a pelican’s bill. It’s long and has a pouch underneath. But in your mental picture, push that pouch forward so that it’s at the base of the lower jaw like a chin, and made of bone instead of soft tissue. Tupandactylus had a sort of keel on the underside of the end of its lower jaw that was probably for display.

Next, the upper jaw is tall but narrow. Maybe it will help to picture a toucan’s bill, but unlike a toucan, Tupandactylus’s upper jaw had a projection at the top that formed the base of the crest. This projection is a big triangular piece of bone that tops the upper jaw, and at the upper point of the triangle there’s a long, thin spur of bone that points upward and bends back. It’s ridiculously long.

Finally, the rear of the skull has another projection that points straight back to form the back of the crest. The tall rod of bone on top of the upper jaw forms the front of the crest. The crest itself was mostly made of soft tissue and keratin stretched between the two bony rods.

To finish our description of the skull, Tupandactylus had no teeth and probably also had a keratin beak at the very tips of its jaws, especially its lower jaw. We don’t know what it ate, but some paleontologists hypothesize it might have mostly eaten fruit and other plant material. It probably spent a lot of time on the ground looking for food and hanging out in its flock, sort of like geese do today.

We have a pretty good idea of what the crest looked like because a few specimens have soft tissue impressions left by the crest when the animal died and fell into mud. The complete crest was like a big sail, although there’s no evidence that it helped the animal fly.

What we don’t know is what color the crest was, but researchers have long assumed it was brightly colored and probably patterned to attract a mate.

In an article published in Nature in April of 2022, a team of paleontologists from Brazil and Belgium announced that they’ve found some amazing details in a newly discovered Tupandactylus skull. Tupandactylus had feathers.

They discovered the feathers at the bottom of the crest, some of them fluffy and some of them longer and more like modern bird feathers. And that’s not all. The feathers are so well preserved that under electron microscopes, the team found preserved melanosomes, which are pigment granules. We still don’t know what colors the feathers were, but they were definitely different colors because the melanosomes are different shapes, and in bird feathers different melanosome shapes correspond to different colors. Simple feather fibers have also been found on the jaws, which suggests that Tupandactylus might have had feathers over much of its body. That means other pterosaurs probably did too.

There are actually two species of Tupandactylus known, T. imperator and T. navigans. T. navigans is smaller and has a smaller, less extravagant crest. Some researchers suggest the two species might actually be the same species, with sexually dimorphic males and females (meaning they look different). Maybe one day we’ll find out for sure.

Thanks for your support, and thanks for listening!

NEW Episode 500: Crikey, it’s 500 episodes!

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It’s our 500th episode! Wow!

Thanks to Rosie, Remy and Julien, and Dylan, Emily, and Michelle for their suggestions this week!

Further reading:

Crikey! Newly Discovered Snake Species Named After Steve Irwin

Steve Irwin’s Treesnail

A young Steve Irwin’s tree snail [photo taken from link above]:

A marbled lungfish:

A fennec, smallest and cutest of all foxes:

Show transcript:

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

This week we have a brand new episode, because it’s episode 500! Congratulations to me and to you too, listening to the 500th episode of a podcast! That doesn’t happen very often!

Despite the big 5-0-0, I’m going to treat this like a regular episode. Thanks to Dylan, Emily, and Michelle, Remy and Julien, and Rosie for their suggestions this week!

We’ll start with Dylan, Emily, and Michelle, who live in Australia. A while back now they got to visit the Australia Zoo, which is run by the Irwin family. Steve Irwin was a conservationist, science educator, and wildlife rehabilitator, also known as the Crocodile Hunter for his work relocating crocodiles who were endangering people, and vice versa. He died tragically young in 2006 but his wife and children continue his work.

Michelle pointed out that Irwin has been honored by scientists who have named newly discovered animals for him, so let’s learn about a few of them!

The most recent one is a type of wolf snake discovered on the Great Nicobar Island off the coast of India and described in 2025, Lycodon irwini. It’s mostly black in color with a slender body, and can grow as much as 47 inches long, or 119 cm. That’s almost four feet long! Luckily it’s non-venomous, plus it has only been found on that one island in evergreen forests, so you’re not likely to run across one by accident. It probably eats small animals like frogs, but we don’t know a whole lot about it yet.

Back in 1990, Steve Irwin caught a strange turtle while fishing with his father, Bob, who was also a conservationist. Between them, the two men knew a whole lot about Australian wildlife but they didn’t know what the turtle was. They sent pictures to a turtle expert, who determined that yes, it was a species new to science. It was described in 1997 and named Irwin’s turtle, Elseya irwini.

Irwin’s turtle has a black and yellow carapace and lives in the lower part of the Burdekin River in northern Queensland. The female also has a light-colored head and other pale spots on the body.

Like some other turtles, it can absorb oxygen from the water through its cloaca, which is often referred to as its butt. A chamber at the end of the cloaca contains structures that act like gills and absorb oxygen. This allows it to stay underwater longer, and in fact it can’t survive in water that doesn’t contain enough oxygen.

As a result, Irwin’s turtle is endangered due to habitat loss, especially from pollution and the damming of its river home. It used to be common but its numbers are in decline. The Australia Zoo started a captive breeding program to help conserve the species, and in 2023 they succeeded in hatching the very first Irwin’s turtle babies ever bred in captivity.

The last one is my favorite, a land snail named after Steve Irwin. It was described as a new species in 2009, only a few years after Irwin died, and was named Crikey steveirwini. It’s the only species in the genus Crikey. It only lives in high altitudes in the tropical rainforests of northeastern Queensland. It’s rare and not much is known about it, because it’s so hard to find and so small. It has a cone-shaped shell that’s striped with spiral bands of brown, yellow-brown, and white, and it only grows 15 mm long at most.

Next, brothers Remy and Julien wanted to learn about the African lungfish. Lungfish are fascinating fish, because as you can probably guess from the name, they have gills but they also have lungs, and the fish needs both to get enough oxygen.

Four species of lungfish live in Africa, all belonging to the family Protopteridae. They’re eel-like in shape although they’re not closely related to eels at all, with soft scales, and a dorsal fin that continues down the fish’s back and continues around the end of the tail, since the dorsal fin and tail fin are actually fused into one big fin. Its only other fins are the pectoral and pelvic, which are very thin and are more like flexible legs than actual fins. The lungfish can actually crawl along the bottom of the swamp or lake with its fins, although it can also swim like an eel.

While the African lungfish does have gills, they’re small and are mostly associated with eliminating carbon dioxide instead of absorbing oxygen. The lungs do most of the work. The fish surfaces periodically to gulp fresh air into its lungs. It’s one of the few fish that can drown if it can’t surface for air.

African lungfish eat insect larvae, especially of aquatic insects, crustaceans, mollusks, small fish, and frogs, but it can also sometimes eat seeds and other plant material. It usually lives in shallow water like swamps and small rivers, where there’s not a lot of oxygen in the water. In many cases, its waterways dry up periodically, but the fish can still survive. As its water gets lower and lower, the lungfish digs into the mud and curls up, then secretes a thick mucus that helps retain moisture and stops its body from drying out. Its metabolism slows way down so it doesn’t need to breathe very often, and it doesn’t need to eat. It can survive this way for up to four years, although it usually only has to stay in its cocoon for a few months, until the rains return and its waterways fill up again.

The smallest species of African lungfish is the East African lungfish, which only grows about 17 inches long, or 44 cm, while the largest is the marbled lungfish that can grow a whopping six and a half feet long, or two meters.

Lastly, Rosie suggested we learn about the fennec fox, which lives in northern Africa. It’s the smallest fox in the world, barely eight inches tall at the shoulder, or 20 cm, but it has incredibly large ears. Its ears can be as much as six inches long, or 15 cm.

Part of the reason its ears are so big is so it can hear insects and other small animals moving around underground, but they’re also big because they help dissipate heat from the fox’s body into the air. Since the fennec lives in deserts, that’s only one of many adaptations it has to the heat and lack of water.

For instance, the fennec gets most of its water through the food it eats. It’s also a nocturnal animal. The pads of its paws are protected by long, coarse hairs that grow between the pads, so hot sand won’t burn its toe beans. The hair also gives the fox better traction in loose sand.

The fennec’s fur is a pale sandy color with a black tip to the tail, and it has dark eyes. It eats rodents, birds and their eggs, insects, scorpions, and other small animals, as well as fruit and other plant material. It can jump really far, some four feet in one bound, or 120 cm. Not only can it run really fast, it can change directions really quickly too. This helps it escape predators and catch prey.

Fennecs can be social animals and like to play, even as adults. Pairs mate for life and both parents take care of the babies. A fennec’s burrow can be very large and may even link up to neighboring fennec family burrow, so neighbors can visit each other without going out into the heat of the day.

You can find Strange Animals Podcast at strangeanimalspodcast.blubrry.net. That’s blueberry without any E’s.

Thanks for listening!

Thanks to those of you who backed my recent crowdfunding campaign! Right now the Small Mysteries book isn’t available yet, but in the Halloween episode in October, I’ll make sure to put a link where you can buy the ebook.

Episode 499: The Mystery of Amiskwia

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Further reading:

Cambrian Explosion Month #18: Stem-Gnathifera

Ambiguous Amiskwia

Amiskwia, possibly [picture taken from above link]:

Show transcript:

Welcome to the Patreon bonus episode of Strange Animals Podcast for May 2025!

We’ve talked about a lot of strange and mysterious animals from the Cambrian in past episodes, especially episode 69, but I don’t think we’ve learned about Amiskwia yet. For a long time it was another mystery animal from the Burgess Shale and a few other places, dating back as much as 518 million years ago, but as of only a few years ago the mystery seems to be solved, at least mostly.

Amiskwia grew about an inch long, or 2.5 cm, which actually made it one of the larger animals that lived in the Cambrian. It probably looked superficially like a slug, with a slightly flattened body and a pair of short tentacles on its head. It had a paddle-shaped tail and two flaps on its sides that probably acted as fins to help it swim. Its mouth was on the underside of its head and was surprisingly complicated, with two pairs of plates with little spikes on them. We even know about its internal anatomy, since some of the Amiskwia fossils are so well preserved that its insides can be studied too. It had a brain and a simple digestive tract.

Amiskwia was described in 1911 by Charles Walcott, who described a lot of the Burgess Shale fossils. Walcott classified it as a type of arrow worm. When scientists gave it a closer look later, not everyone agreed it was related to modern arrow worms. Some suggested it might be a type of ribbon worm, or maybe an early mollusk, while others argued that it was so different from known animals that it belonged in its own phylum.

A 2019 study suggested that Amiskwia’s weird mouth plates matched up with the mouth plates in a living animal, and a 2022 follow-up study confirmed the 2019 findings. Not everyone agrees, but as of now, Amiskwia is considered an ancestral gnathiferan.

There! Mystery solved! Wait, what do you mean you don’t know what a gnathiferan is?

As everyone knows, especially me, I definitely didn’t just learn about this type of animal myself just now, gnathiferans include a lot of different animals with complex jaws—not like your own jaws, but with little plates and spikes and moving parts made of chitin. Most gnathiferans are tiny, microscopic or barely a few millimeters long, so Amiskwia was a giant in comparison.

Arrow worms are also generally considered to be gnathiferans, so Wolcott wasn’t too far off in his description of Amiskwia. We don’t know what Amiskwia ate, but it could probably swim pretty well and most likely hunted other animals or scavenged already dead ones. Scientists think it probably spent most of its time swimming well above the sea floor, which is why it’s a relatively rare fossil.

Another Cambrian mystery animal that lived even earlier than Amiskwia, around 520 million years ago, and which is probably related to it, is Timorebestia. Its fossils were discovered in Greenland and only described in 2024. It had a pair of long tentacles or antennae, a rounded paddle-like tail, and fins on each side of its wide, flattened body. Its tentacles were around half the length of its body–and if Amiskwia was a giant compared to modern gnathiferans, Timorebestia was a colossus! It grew almost 8 inches long, or over 20 cm, not even counting its tentacles!

Some Timorebestia specimens are so well preserved that scientists can identify what they ate right before they died, and it looks like they mostly ate small arthropods. Timorebestia was probably the biggest and strongest predator in the area when it was alive, one of the earliest apex predators discovered.

Another similar animal was Nectocaris, which has been discovered in the Burgess Shale of Canada and other Cambrian fossil sites in China and Australia. It was flattened and had a pair of tentacles on its head, and a fin on both sides of its body–but it had a lot of features not found in Amiskwia and Timorebestia, including eyes. It also seems to have had a tube or funnel of some kind that emerged from the underside of the body near the head. It might have been a proboscis of some kind, but some scientists think it was a funnel like the ones found in modern squid, used to jet through the water quickly. Many scientists even think Nectocaris was a precursor to squid and other cephalopods, but other scientists disagree. Some specimens are about one inch long, or around 3 cm, while others are around 4 inches long, or about 10 cm. This might mean there were two species, or that the small ones were juveniles, or that males and females were different sizes. We just don’t know.

Small animals, especially ones with mostly soft bodies, don’t fossilize as often as larger and more robust animals. We’re very lucky that we have so many beautifully detailed Cambrian fossils, since so many modern gnathiferans and their close relations aren’t otherwise found in the fossil record at all.

Thanks for your support, and thanks for listening!

Episode 498: Octopolis

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Further reading:

https://sharonahill.substack.com/

https://metazoan.net/54-octlantis/

https://metazoan.net/109-octopolis-and-octlantis/

Scientists discover an underwater city full of gloomy octopuses

The gloomy octopus [photo by Niki Hubbard – https://www.inaturalist.org/photos/118664956, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=123044473]:

Show transcript:

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

As I’ve mentioned before, I really don’t like April Fools Day, which is April first. I especially don’t like it when someone makes an April fools day post online and just leaves it there afterwards. It’s too easy for other people to stumble across it and think it’s real. This goes double for strange animal and cryptid reports.

I subscribe to geologist Sharon Hill’s Pop Goes the Cryptid articles, and on March 31 she talked about a hoax called the North American Pine Squid. It got popular around Halloween of 2024. It’s said to be a black squid or octopus that lives in pine trees in remote, heavily forested places like the Pacific northwest and the Appalachian mountains. Most of the time it eats small animals like birds and squirrels, along with pine cones, but if someone walks underneath its tree, the pine squid grabs the person, pulls them up into the tree, and they’re never seen again.

But you don’t have to worry, because the pine squid isn’t a real animal. It’s also not even a new story. It’s based on another hoax called the Pacific Northwest tree octopus, which dates back to 1998. In the case of the tree octopus, it wasn’t created as a hoax or an April fool’s joke but as a study about whether children can tell if a website is reliable or not. The researchers made a page with information about a type of octopus that lived in the ocean but that also climbed trees. Then they asked several classrooms of children around age 11, from different schools in different countries, to read the page, look at the pictures provided, and answer some questions.

The study found that most of the children thought the page contained reliable information. Only a few figured out that the tree octopus wasn’t real. The study has been used repeatedly to argue that children need more lessons in how to evaluate a website to know if it contains reliable information, and of course that’s always a good thing. But it makes me a little angry too, because how were the kids supposed to know that octopuses can’t climb trees? There are so many amazing and strange animals out there, a tree octopus sounds perfectly normal if you don’t know very much about octopuses. So I argue that kids should be taught about everything, and taught in as interesting a way as possible so that they remember it better. The same goes for adults.

But this episode isn’t actually about April fools day, tree octopuses, or pine squids. It is about a type of octopus, and what I’m going to tell you is so weird that I have to reassure you that it’s actually true. It’s not a hoax or an April fools joke or anything like that. It’s about the gloomy octopus and the underwater cities some populations have created, referred to as Octopolis and Octlantis. I swear I’m not making this up!

The gloomy octopus lives off the eastern coast of Australia and the northern coast of New Zealand. It’s mainly brown and gray, but it has orange on the undersides of its arms, and it’s covered in little bumps that help camouflage it. Its eyes are white. On average, it has an armspan of about 6 ½ feet, or 2 meters, with females generally larger than males. Like many other octopuses, when the female lays her eggs, she stops eating completely and protects the eggs until they hatch. After they hatch, she dies.

The gloomy octopus lives in shallow warm water and especially likes places with lots of rocks, seagrass, reefs, and other places where it can hide. It spends a lot of time in a den it digs into the sea floor, only coming out at night to hunt. It especially likes scallops, but it will eat pretty much anything it can catch, including sea snails, crabs, seahorses, and even other gloomy octopuses. It usually brings its food back to its den to eat.

The gloomy octopus was thought to be a solitary animal until 2009. That’s when a biologist named Matt Lawrence was exploring Jervis Bay in New South Wales. In this particular part of the bay, the sand is silty and there are a lot of predators, so it’s not great for the gloomy octopus. But not only did Lawrence find a gloomy octopus there, he found 16 of them living in close proximity.

The octopuses’ dens were very close to each other, surrounding a human-made object that’s so encrusted with sea life that it can’t be identified. Scientists think it was a piece that fell off a boat at some point. Even more interesting, there are so many shells around, especially scallop shells, that instead of making dens in the sand, the octopuses are basically making dens in huge piles of scallop shells. The octopuses spend time moving the shells to improve their dens.

In other words, Lawrence had found an octopus city. Admittedly, it’s a very small city by human standards, with only 16 residents identified at any given time, but for a supposedly solitary animal, that’s pretty amazing.

The site was nicknamed Octopolis, and scientists think the presence of the piece of boat actually started the site. When it fell into the sand, it provided a great place for a gloomy octopus to hide. Since gloomy octopuses bring mollusks back to the den to eat, naturally they discard the shells near their dens. Once enough discarded shells had piled up, it provided better building material for another den. Another octopus moved in as the first one’s neighbor, which meant twice as many shells being discarded. Pretty soon another octopus joined the first ones, and eventually there were 16 separate dens in a little community.

Then, in 2017, another octopus city was discovered not far from Octopolis. Instead of a human-made object at its center, it has a few rocks sticking up in the middle of the city, which has been nicknamed Octlantis.

Observations of the octopuses living in these communities are surprising. The octopuses come out during the day even though ordinarily the gloomy octopus is most active at night, especially around dawn and dusk. They interact with each other in various ways, sometimes fighting, sometimes pairing off to mate, sometimes sneaking into another octopus’s den and trying to take it over. It might not be full of underwater skyscrapers and underwater scallop vendors on busy corners, but there’s a lot of hustle and bustle in these cities.

When biologists revisited Octopolis in 2023, they only found three octopuses. Octlantis had a little more activity and a few more octopuses, but nothing like its busy 2017 numbers. But this doesn’t mean that the cities are deserted. Low Octopolis populations were also discovered in 2010 and 2013, but a high population in between. The biologists also noted that the presence of sharks caused the octopuses to move, and in 2023 a shark was hanging around Octopolis.

Another reason for the changing population sizes at the sites is that gloomy octopuses don’t live very long. A three-year-old gloomy octopus is really old, since most die before they reach their first birthday. The octopuses spotted in Octopolis and Octlantis in 2023 might be as much as 14 generations removed from the ones seen in 2009. Young octopuses have to continually repopulate the cities as the older ones die off, and that might take longer some years than others.

Just because we know about Octopolis and Octlantis doesn’t mean those are the only two octopus cities in existence. There are probably a lot more. Scientists just haven’t noticed them yet. In years where sharks are spending too much time in Octopolis, the octopuses might just move to a city we don’t know about. Octopolis and Octlantis might even be really small in comparison to some cities. If you’re a diver around Australia or New Zealand, keep a sharp eye out for an octopus city. You might be the first human to visit New Octleans.

Thanks for your support, and thanks for listening!

Episode 497 Megarachne

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Megarachne as we know it now:

Show transcript:

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

Megarachne is only known from two specimens, neither of which is complete, which adds to the confusion. It lived around 300 million years ago in what is now South America. It was described in 1980 from the first specimen discovered and was named Megarachne, which means big spider. The scientist who described it thought it was a type of primitive spider related to modern tarantulas, but much bigger. He estimated its legspan was 20 inches, or 50 cm, with a body length of just over 13 inches, or 34 cm. That made it the largest spider ever known by a lot.

Other palaeontologists, especially arachnologists who specialize in spiders and their relations, weren’t convinced Megarachne was a spider. But it wasn’t until 2005 when a more complete specimen was discovered that anyone could say for sure what it was. The second specimen made it clear that it wasn’t a spider at all but a sea scorpion, or eurypterid, and not an especially large one compared to some. It probably grew to 21 inches long, or 54 cm.

But by then, Megarachne had gotten really popular as a giant spider. It was in the BBC documentary Walking with Monsters, although the producers changed its name to Mesothelae right before it aired, which was just after the new findings about Megarachne came out. Mesothelae is a suborder of big spiders from parts of Asia that retain many traits of ancestral spiders. It was a valiant attempt by the BBC to make the documentary less incorrect, but of course the spider they were talking about still wasn’t a spider and no spider known has ever grown that large.

But while Megarachne isn’t a giant spider, and isn’t even a very big eurypterid, it is important since not very many eurypterids are known from South America. It also appears to be closely related to Mycterops and Woodwardopterus, similar-looking euripterids from North America and Europe. But some researchers think it’s not as cut and dried as it sounds. Instead of three similar creatures living in different areas, they think there’s something else going on.

Eurypterids were arthropods, the phylum that includes insects, arachnids, and crustaceans, among others. Arthropods have an exoskeleton that they molt periodically as they grow, and many arthropods have complicated life stages compared to other animals. When a shark hatches, it looks like a miniature adult and just grows larger as it gets older, but when an arthropod hatches, it usually doesn’t look anything like its adult form. Some arthropods go through many stages of life before reaching the adult body plan. Crustaceans have numerous larval stages, for instance, that often look very different from the adult. Some researchers think that Megarachne, Mycterops, and Woodwardopterus were all the same animal, and that the differences are due to it being in three different stages of development when it died and was preserved.

We don’t have any way to know if this was correct, of course, not until we hopefully find more fossil remains. Other eurypterids did appear to go through some physical changes during maturation, as far as researchers can tell with the remains we have, but Megarachne, Mycterops, and Woodwardopterus belonged to a different family from other eurypterids and are much rarer. They might have been quite different developmentally.

We can also look at the living relations to see how likely it is that eurypterids had different larval stages where they looked different from the adult form. Eurypterids were probably most closely related to horseshoe crabs, although not everyone agrees. Horseshoe crabs have been around for 445 million years and are really neat animals that we’re lucky to still have in the world. The horseshoe crab hatches into a larva that looks a lot like a trilobite. It does indeed go through physical changes as it grows and molts over the course of three years, so it’s reasonable to assume that eurypterids did too.

On the other hand, some researchers think eurypterids were more closely related to modern scorpions. Scorpions actually give birth to live babies instead of laying eggs, and the female carries the babies on her back for several days up to several weeks, depending on the species. Once the babies have their first molt they look a lot more like miniature adults and pretty soon are able to leave their mother and hunt on their own. So again, it’s possible that eurypterids had a system more like this instead of like the horseshoe crab’s.

While we’re talking about scorpions, did you know that scorpions glow blue-green in ultraviolet light? The scorpion’s exoskeleton contains fluorescent chemicals, but we’re not sure why. Scorpions do have incredibly light sensitive eyes, and can navigate at night using only starlight. Their eyes can’t form sharp images like ours can, though. And scorpions have a lot of eyes. Spiders have four pairs of eyes, but some scorpions have more than that. All species have a pair on top of the cephalothorax, which corresponds to the head, and more on the sides of the cephalothorax. Some species have up to five pairs of eyes in addition to the ones on top of the head. Twelve eyes seems like overkill but it works for the scorpion. Eurypterids had both compound eyes and simple eyes.

That’s all we know about Megarachne right now, at least until we find more fossilized specimens. Let’s hope we do, and while we’re at it, let’s hope we find some more fossilized giant spiders because that would be cool.

Thanks for your support, and thanks for listening!