Episode 402: The Hoop Snake and Friends

Thanks to Nora and Richard from NC this week as we learn about some scary-sounding reptiles, including the hoop snake!

Further reading:

The Story of How the Giant “Terror Skink” Was Presumed Extinct, Then Rediscovered

San Diego’s Rattlesnakes and What To Do When They’re on Your Property

Snake that cartwheels away from predators described for the first time

Giant new snake species identified in the Amazon

The terror skink, AKA Bocourt’s terrific skink [photo by DECOURT Théo – Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=116258516]:

The hoop snake according to folklore:

The sidewinder rattlesnake [photo taken from this article]:

The dwarf reed snake [photo by Evan Quah, from page linked above]:

The green anaconda [photo by MKAMPIS – Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=62039578]:

Show transcript:

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

As monster month continues, we’re going to look at some weird and kind of scary, or at least scary-sounding, snakes and lizards. Thanks to Nora and Richard from NC for their suggestions this week!

We’ll start with the terror skink, whose name should inspire terror, but it’s also called Bocourt’s terrific skink, which is a name that should inspire joy. Which is it, terror or joy? I suppose it depends on your mood and how you feel about lizards in general. All skinks are lizards but not all lizards are skinks, by the way.

The terror or possibly terrific skink lives on two tiny islets, which are miniature islands. These islets are themselves off the coast of an island called the Isle of Pines, but in French, which I cannot pronounce. The Isle of Pines is only 8 miles wide and 9 miles long, or 13 by 15 km, and is itself off the coast of the bigger island of New Caledonia. All these islands lie east of Australia. Technically the islets where the skink lives are off the coast of another islet that is itself off the coast of the Isle of Pines, which is off the coast of New Caledonia, but where exactly it lives is kept a secret by the scientists studying it.

The skink was described in 1876 but only known from a single specimen captured on New Caledonia around 1870, and after that it wasn’t seen again and was presumed extinct. Colonists and explorers brought rats and other invasive animals to the New Caledonian islands, which together with habitat loss have caused many other native species to go extinct.

But in December 2003, a scientific expedition studying sea snakes around the New Caledonian islands caught a big lizard no one recognized. Once the expedition members realized it was a terror skink, alive and well, they took lots of pictures and videos of it and then released it back into the wild. Since then, more specimens have been discovered during four different expeditions, but only on the islets, not on any of the bigger islands. It’s so critically endangered that its location has to be kept secret, because if someone captures some of the lizards to sell on the illegal pet market, the species could easily be driven to extinction.

The terror skink is gray-brown with darker stripes, a long tail, and a slightly downturned mouth that makes it look grumpy. It grows about 20 inches long, or 50 cm, including its tail. This is really big for a skink, so technically it’s a giant skink.

It gets the name terror skink from its size and from its teeth, which are large and curved like fangs. It mainly eats one particular species of land crab, which is why its jaws are so strong and its teeth are so sharp, so it can bite through the crab’s exoskeleton.

Another lizard with a spooky name that has been presumed extinct is the gray ghost lizard, suggested by Richard from NC. It’s more properly called the giant Tongan ground skink, and it’s native to some more South Pacific islands—specifically, the Tongan Islands. These islands are even farther east from Australia than the New Caledonian islands, and are actually closer to New Zealand than to Australia, although they’re not really very close to either.

The giant Tongan ground skink was described in 1839 from two specimens collected in the late 1820s on Tongatapu Island. They’re the only two specimens known and the lizard is considered extinct, especially considering that these days, the island is almost completed deforested and rats, dogs, and cats have been introduced to it, which has driven many species to extinction.

But after the terror skink was rediscovered, scientists started to wonder if the gray ghost might still be around. It was called the gray ghost because it was so hard to see, since it was dark gray in color. The native Tongan people considered it a good omen if someone saw one, since it was so rare.

A paper published in early 2024 suggests that the gray ghost might be living on some smaller islands where forests still remain, and also suggested that it might be nocturnal and a burrowing skink. That would explain why it was so rarely seen by the people who lived on its island when it was still alive.

We know basically nothing about the gray ghost. Hopefully an expedition to the smaller Tongan islands will rediscover it so we can learn more about it and protect it.

Richard from NC also suggested we talk about the hoop snake, an animal of folklore. I remember reading about it as a kid in a book about American folklore animals, most of which were clearly jokey and not meant to seem real. The hoop snake sounded more realistic.

The hoop snake was supposed to be a long, slender snake that slithered around normally most of the time, but when it needed to move faster, it would grab the end of its tail in its mouth and roll like a wheel, or a hoop. Some versions of the story had the snake rolling along with the tip of its tail pointed forward, and since the tail was supposed to be sharp and venomous, it would roll after you so fast that when its tail stabbed you, you’d drop dead. The only way to escape would be to jump behind a tree. The tail would stab the tree instead and you could run away while the hoop snake was trying to unstick its tail. The venom in its tail was supposed to be so deadly that the tree would turn black and die. Other versions of the story said you had to jump through the snake’s hoop to confuse it, which would allow you to get away safely.

All this is weird, to say the least, but some snakes do have ways of traveling that are unusual. The sidewinder, for instance, is a real species of rattlesnake from the southwestern United States and northwestern Mexico. It grows around 2 ½ feet long, or 80 cm, and has pointy scales, called keeled scales, including a pair above its eyes that make it look like it has little horns. Since it’s a type of rattlesnake, it has a rattle that it can shake to make a loud warning noise. It’s mostly brown in color, or sometimes pinkish, yellowish, or even whitish, with darker stripes or blotches down its back. Its coloration helps camouflage it against the ground, and it will actually change color slightly depending on the temperature. This is something other rattlesnakes can do too.

The sidewinder lives in desert conditions where it has to travel through loose sand, and the sand is also extremely hot. While the snake can travel normally when it wants to, it sidewinds to move quickly over loose sand or very hot sand that might burn it. It lifts most of its body up so that it’s only touching the ground in two places, then undulates its body so that the sections touching the ground constantly move. That way no part of its body has to stay in contact with hot sand for more than a split second. It travels in a path that runs diagonal to the direction its body is pointing. That sounds complicated, but it’s easy for the snake. It’s not even the only snake that can travel by sidewinding. Other desert-living snakes travel across hot sand by sidewinding, including several species from Africa, but just about any snake can do it if they need to. It allows a snake to travel over surfaces that are too slippery for its belly scales to get a grip.

The story of the hoop snake might be based on garbled reports of sidewinders, but it might just be a completely invented animal. The hoop snake story is found in other parts of the world too, especially Australia, although it dates back to at least the late 18th century in the United States.

No snake in the world has the anatomy to allow it to roll like a hoop without hurting itself. But there is one other snake that does something very similar, called cartwheeling. It’s the dwarf reed snake that lives in Malaysia and other parts of southeast Asia. Reed snakes aren’t very well known to science, so this cartwheeling activity wasn’t documented scientifically until recently, with the study published in 2023. Reed snakes are nocturnal and spend most of the daytime hiding under rocks or logs, or buried in dead leaves or sand, so they’re not seen very often by people. The dwarf reed snake is slender and only grows about 10 inches long, or 25 cm.

Some small snakes can jump short distances by pushing their tails against the ground. The dwarf reed snake does something similar, but more complicated. It pushes off with its tail, with its body curved in a sort of S shape. It lands on its head and rolls over completely, head to tail, and then pushes off the ground again with its tail. It can move extremely fast in this way to get away from predators, but it takes a whole lot of energy. But when it’s moving downhill, with gravity on its side, it can continue to cartwheel longer.

Cartwheeling isn’t something the snake does often, and it’s rare that a human would ever observe it. But just like sidewinding, some scientists think cartwheeling might be a motion that more snakes can do if they really need to. Maybe that’s where the hoop snake legend started.

Let’s finish with a suggestion from Nora, who wanted to learn more about the green anaconda. That’s a scary snake for sure, because it happens to be the biggest snake alive today, and almost the longest, as far as we know.

The green anaconda lives throughout much of South America, although not in Patagonia because like most reptiles, it needs warm weather to function. It’s a beautiful olive green with black blotches, and it’s a big, bulky snake. It spends a lot of time in the water, which helps it stay cool in hot weather and helps support its weight comfortably, and its eyes are near the top of its head so it can watch for prey while it’s mostly submerged.

The anaconda is a member of the boa family and is a constrictor. It’s not venomous, but you really don’t want a hug from a hungry anaconda. Its body is bulky because it’s incredibly strong, and once it starts to contract its muscles, whatever it’s constricting has only minutes left to live. It can kill animals as large as caimans, which are a type of crocodile, tapirs, capybaras, deer, and even jaguars. For the most part, though, an anaconda doesn’t want to bother with prey that could potentially hurt it, so it will stick with smaller animals that are still big enough to make it worth the effort. And yes, it is possible that an anaconda in the wild could kill and eat a human, but there’s no reliable evidence that it’s ever happened.

It’s hard to know exactly how long and how heavy an anaconda can get. There are lots of stories of 30-foot, or 9-meter snakes, but that seems to be a wild exaggeration. Snakes are stretchy, and a healthy live snake doesn’t really want to stretch out straight to be measured. A dead snake is even stretchier than a live snake. A shed snakeskin is the stretchiest of all, and usually has stretched out quite a bit when the snake was shedding. A good estimate is that a big female anaconda can grow about 20 feet long, or 6 meters, and can weigh around 250 lbs, or 114 kg. Males are smaller on average, and a wild snake will weigh less than one kept in captivity.

There are definitely larger individual anacondas, especially considering that reptiles continue to grow throughout their lives, but they’re probably not that much longer. This is only a little shorter than the reticulated python, which can definitely grow up to 23 feet long, or 7 meters.

One important detail about the size of the green anaconda is that the biggest snakes live in the Amazon rainforest–but the Amazon rainforest is really hard for humans to navigate safely and most anacondas killed or kept in captivity lived in other parts of South America. So there might easily be anacondas in the rainforest that are much bigger than the ones scientists have been able to measure so far.

In February of 2024, a journal article was published about a 2022 National Geographic nature documentary and scientific expedition to the Amazon basin to find a rumored population of extra-large anacondas. The expedition was led by hunters from the Waorani people, who consider the snakes sacred, and the hunters and their chief were credited as co-authors of the paper, as they should be since they provided so much information.

The scientists were able to examine several fully grown anacondas and take tiny tissue and blood samples to test later. They were astounded at the size of the snakes they found, including one that measured 20 and a half feet long, or 6.3 meters. The hunters reported seeing snakes that they estimated as over 24 feet long, or 7.5 meters, that might have weighed as much as 500 pounds, or 226 kg.

Beyond mere size, though, is something very interesting, which the scientists learned when they got home and ran genetic tests. The anacondas are actually quite different genetically from other anacondas known to science, that live farther south. They described the snake as a new species, which they refer to as the northern green anaconda, but it has actually resulted in a lot of controversy. Some scientists agree that the northern green anaconda is a separate species, others think it’s only a subspecies of the green anaconda, while others think the genetic differences are minor and separating the northern green anaconda from other anacondas isn’t justified by the evidence.

Obviously scientists need to follow up and learn more about the anacondas, but one thing is clear. There are some really, really big snakes out there in the Amazon.

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. 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 021: The Tatzelworm and friends

Episode 21 is all about the Tatzelworm, a mysterious reptile from the Alps, and some of its mystery reptile friends from around the world!

Further reading:

The Iraqi afa – a Middle Eastern mystery lizard

Giant Lizard Discovered in the Philippines

Bipes, a two-legged amphisbaenid from Mexico:

A cute little skink. Big eyes, little legs:

A handful of bigger baby skinks. OMG WANT

A modest-sized monitor lizard in a tree:

The newly discovered Northern Sierra Madre forest monitor, Varanus bitatawa:

Show transcript:

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

This week we’re going to examine some mysterious reptiles. If you like this episode, there’s a companion episode for Patreon subscribers about the Beast of Busco, which you can access for a mere $1 pledge a month (just saying). But honestly, I’m just happy to have you as a listener no matter what.

Let’s start with a mystery animal that has intrigued me for a long time. A lot of cryptids are described as gigantic, or they live in far remote corners of the world. But the tatzelworm is a modest animal that lives in the Alps.

Generally, the tatzelworm is described as a sort of lizard with a snakelike body between one and three feet long [30 cm to 1 m], gray or whitish, with large bright eyes, a rounded head often described as catlike, and small forelegs. Sometimes it’s described as having no legs at all, only front legs, or the normal complement of four legs.

There have been a lot of sightings over the years, going back to at least the early 16th century. The earliest sightings are of tatzelworms seven feet long [2 m], which I’m inclined to put down as exaggerations over the years. The earliest documented sighting is from around 1711, when a man named Jean Tinner and his father spotted one on Frumsemberg Mountain, Switzerland. Tinner described it as coiled up on the ground, limbless, but with a catlike head. In 1779, a man named Hans Fuchs saw two of them, ran home in a panic and told his family, and promptly dropped dead of a heart attack.

The more recent sightings are of more reasonably sized animals. In 1921, a poacher and his friend hunting in the Alps in Austria saw a tatzelworm on a rock, watching them. It was gray, two or three feet long [61-92 cm] with two legs, a thick tail, and a catlike head. Its body was described as thick as a human arm and its head was fist-sized. The poacher shot at it but it jumped at the men and they ran.

In 1922, two sisters playing in the woods in St. Pankraz, Austria saw one crawling among some rocks. It was gray, a bit over a foot long [30 cm], and looked like a giant worm, but had a pair of paws behind its head.

The clearest and most reliable description we have comes from April 1929, when an Austrian teacher searching for a cave entrance spotted a tatzelworm. In his book The Lungfish, the Dodo, and the Unicorn, Willey Ley quotes the teacher’s account, which I’ll read.

One note: Tempelmauer means temple wall. Karl Shuker indicates in his book The Beasts That Hide from Man that the teacher was climbing Mount Landsberg. I can’t find the original of the account; it’s undoubtedly in German, and since Ley was born in Berlin, he may have translated the account himself. There is a mountain called Landsberg in Austria with two peaks, called Grosser and Kleiner Landsberg respectively. Since the teacher mentions cliffs, it could be these are the structures referred to as temple walls by locals.

Anyway, here’s the account from Ley’s book, page 133:

“Well equipped, I started out on a spring morning and after a short climb I reached the top of the Tempelmauer. After a short rest between the cliffs I started to look for the entrance to the cave. Suddenly I saw a snake-like animal sprawled on the damp rotting foliage that covered the ground. Its skin was almost white, not covered with scales but smooth. Its head was flat and two very short feet on the fore-part of the body were visible. It did not move but kept staring at me with its remarkably large eyes. I know every one of our animals at first glance and knew that I faced the one that is unknown to science, the tatzelwurm. Excited, joyful, but at the same time somewhat fearful, I tried to grab the animal but I was too late. With the agility of a lizard the animal disappeared in a hole and all my efforts to find it were in vain. I am certain that it was not my imagination that let me see the animal but that I observed with a clear head.

“ ‘My’ tatzelwurm did not have large claws but short and atrophied-looking feet; his length did not exceed 40 or 45 centimeters [16-18 inches]. Most probably the tatzelwurm is a rare variety of salamander living in moist caves and coming only rarely to the light of day.”

The tatzelworm has many local names, including stollworm or stollenworm, springworm, and so forth. Tatzelworm is almost always translated as “clawed worm” online, but according to Ley it means a worm or snake with paws. Stollworm means cave worm, springworm means jumping worm, and stollenworm means hole worm. Worm in this instance means anything snakey or wormy, that kind of shape.

While the various local legends state that tatzelworms are aggressive, venomous, and attack local livestock, the actual sightings are all pretty innocuous. Tatzelworms aren’t out there eating people. In fact, they’re usually pretty hard done by when meeting humans. In the South Tyrol area of Italy, one winter a year or two prior to 1910, a farmer found a torpid tatzelworm in some hay, either asleep or hibernating. He killed it, of course, and noted that he saw green liquid seeping from its mouth after it was dead. He didn’t save the body.

That’s the problem with all these sightings. We need a body. In 1828, a peasant in Switzerland found a tatzelworm corpse in a dried-up marsh. He collected it, but before he could send it to be examined, crows ate it. He did eventually send the skeleton to Heidelberg, but it either never arrived or was lost when it got there.

In 1969, two naturalists supposedly found the skeleton of a lizard-like animal in the Alps, near Domodossola, Italy, but I can’t find any further information about it, so the skeleton was probably found to be nothing mysterious.

There have been hoaxes, of course. The photo of a snakelike skeleton with enormous clawed arms: hoax. At various times, stuffed specimens, dead animals, reptile skins, and photographs have been offered as proof of real tatzelworms, but every case has proved to either be a hoax or a misidentification of a known animal. The Alps are a huge mountain range some 750 miles long, crossing eight countries. They’re not as high as the Andes, Himalayas, or Rockies, but like those mountain ranges, they have plenty of unexplored, hard to reach areas. Plants and animals new to science are still occasionally found there, including a new species of viper only discovered in 2016.

At one point the Nature and Forestry departments in Austria insisted that the tatzelworm was just an otter, but locals naturally scoffed at this. They knew what otters looked like, and this was no otter.

The giant salamander hypothesis is a little more reasonable in that the tatzelworm does seem to like wet areas. In fact, in some parts of the Alps its appearance is said to be an omen of flooding. But if you listened to episode 14 about giant salamanders, you’ll probably agree with me that the tatzelworm doesn’t sound at all like those big guys.

There are other large salamanders that aren’t related to actual giant salamanders, and which are much more slender. Amphiumas are snakelike salamanders that live in water and have vestigial limbs, and the siren salamanders are eel-like with four limbs. The greater siren can even grow to almost three feet long [1 meter]. But those are only found in North America, and none of the known sightings of the tatzelworm seem to be describing an amphibian.

If you’ve listened to episode 10, about electric animals, you might remember the Mongolian death worm. In that episode, I suggested a new species of amphisbaenid might be responsible for reports of the death worm. There are over 180 species of amphisbaenians, most of them legless, but four species found in Mexico have tiny forelegs but no hind legs. It’s possible the tatzelworm is an unknown amphisbaenid. They’re burrowing reptiles, usually no longer than about six inches long [15 cm], that eat insects and earthworms. They resemble earthworms, for that matter, although they have scales. They move like a worm, too, sometimes called accordion-like movement, and can move backwards that way as well as forwards. Most species have blunt heads and blunt tails, so that it’s hard to tell which end is which, and since their eyes are tiny and almost invisible, that adds to the confusion.

But the tatzelworm’s eyes are frequently referred to in sightings as being large and bright, and no one could describe any amphisbaenid as cat-headed. It’s hard to tell where the head is at all.

A skink, on the other hand, might fit the description. Skinks are long, slender lizards with large eyes and somewhat rounded heads. Many species have no legs and most species with legs have very small ones. In 2012, a skink with a pair of tiny forelegs and no hind legs was discovered in Thailand, and the common burrowing skink from South Africa only has hind limbs.

Most skinks like to burrow. Some even dig elaborate tunnel networks. A skink will frequently come out to bask in the sun, but will flee to its burrow if disturbed. Skinks are generally bigger than amphisbaenids too. The Solomon Islands skink is over a foot long [30 cm] not even counting its tail. So it’s not out of the question that the tatzelworm might be a skink that can grow up to several feet long [1 m] and either has no hind limbs or quite small ones that are easily overlooked. Skinks with reduced limbs move like snakes, not like worms.

There is a genus of skink that has green blood, incidentally. Species of Prasinohaema live in New Guinea and the Solomon Islands, and their blood is green because of the massive amounts of biliverdin, a waste product of the digestive system that is toxic in large amounts. But these skinks are immune to the toxicity. Researchers think it may be a protection from blood-borne parasites like malaria, so since the Alps aren’t exactly a hotbed of tropical parasites, they can probably be ruled out. It’s neat, though. The blood still contains hemoglobin, which is what makes blood red, but there’s so much of the biliverdin that you can’t tell that there’s any red in there at all. In 2007, a green-blooded frog was found in Cambodia too.

There don’t seem to have been very many organized searchers for the tatzelworm. In the 1930s an expedition was sponsored by a Berlin magazine, but I couldn’t find any information about it. In 1997, cryptozoologist Ivan Mackerle led an expedition in the Austrian Alps without any luck. He also interviewed locals about the tatzelworm and discovered that only older residents knew about it, and he suggested it may be extinct. Since the expedition was only a week long, I think he might be jumping the gun a little bit.

By the way, if anyone is thinking of planning an expedition of their own, I am totally available to hunt for tatzelworms in the Alps if you want to buy me a plane ticket. I am not even kidding.

There are plenty of other mystery reptiles out there, of course. Take the so-called kumi lizard. In 1773, a Maori chief told Captain Cook about a huge lizard that lived in New Zealand. It grew 5 to 6 feet long and lived in trees, and while the Maori were afraid of it, they also hunted and ate it. In 1898, a Maori bushman in Arowhana, New Zealand reportedly saw a lizard five feet long [1.5 m]. It threated him, then retreated and climbed a tree. That was the last reported sighting of the kumi lizard, but some possible subfossil remains were found. In 1874, a partial lower jaw of an unknown lizard was found in a cave in central Otago. It’s possible that occasionally a crocodile monitor, which lives in New Guinea and can grow up to 13 feet long [4 m], might be carried by currents to New Zealand. On the other hand, that’s a 3,000 mile trip [4,800 km] over open ocean. It’s more plausible that there was once a monitor lizard or another type of large lizard native to new Zealand, but that it went extinct a few hundred years ago. It might even still be around.

In 2009, a new species of monitor lizard was discovered in the Philippines, even though the island where it was found is heavily populated and the lizard is more than six feet long [1.8 m]. It’s an arboreal species, living high in the treetops, and it mostly eats fruit. Local hunters knew about it, but scientists had no idea it existed until photographs made it online. A two-month search resulted in the discovery. (I would happily spend two months in the Alps looking for the tatzelworm. I read Heidi, like, so many times as a kid.)

In a book called The Marsh Arabs published in 1964, explorer Wilfred Thesiger mentions a huge lizard called the afa. Thesiger lived for some eight years among the Madan, a group of people from the marshlands around the Tigris and Euphrates rivers. They said that the afa lived in the marshes around the mouth of the Tigris in what is now Iraq. Unfortunately, not only did Thesiger not give any other information about the afa, the rivers have now been diverted away from the area. The marshes are now desert, the madan are long gone, and if the afa ever existed, it’s probably dead.

I was going to end the episode there, but that is way too depressing, so we’ll finish up with one more mystery reptile. The Milton lizard is a mystery from Kentucky in the United States. In July of 1975, Clarence Cable, co-manager of the Bluegrass Body Shop in Milton, Kentucky, saw a huge lizard behind some junked cars. His brother saw the lizard a few days later. Then Cable saw it again the next day. He threw a rock at it and it vanished into some brush, and that was the last anyone ever saw of it.

Cable said the lizard may have been as much as 15 feet long [4.6 m] with black and white stripes overlaid with speckles, and looked like a monitor lizard. That’s probably what it was, too. Monitor lizards are often kept as pets. If one escaped or was turned loose in the area, it would have survived all right until the weather turned too cold. So if you have a pet monitor lizard, keep it safe and warm, and don’t let it wander around in strange junkyards.

You can find Strange Animals Podcast online 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. We also have a Patreon at patreon.com/strangeanimalspodcast if you’d like to support us and get twice-monthly bonus episodes for as little as one dollar a month.

Thanks for listening!