ExtinctZoo - Why Islands Turn Animals Into Giants

Episode Date: September 20, 2025

Turns out that skull island really isn't that far fetched... ...

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Starting point is 00:01:07 And the worst part, this isn't even unusual here. Welcome to the absolutely unhinged world of island gigantism. Now, you might think being stuck on an island would make things smaller, considering how there's less food, less space, and fewer resources. And that makes sense at all, but that's not how it really works, at least not all the time, as sometimes evolution does the exact opposite, making small things giant or big things even bigger. And so, So, give an animal a few thousand years of isolation on some random island, and suddenly you've got rats the size of house cats, insects that could probably arm wrestle you, and giant crabs that have literally evolved to climb trees and smash open coconuts.
Starting point is 00:01:44 And scientists call this phenomena the island rule, or if you're feeling fancy, Foster's rule, after the biologist Jay Bristol Foster, who first described this madness in 1964. And what Foster basically discovered was that islands are where nature goes to beta test its weirdest ideas. And like every beta test, these ideas don't always work out. And one test that obviously failed is an animal so famous that we often think of it as the poster child for extinction, the dodo bird. But what most people don't know is that the dodo, i.e. Raffis cacolatus, is actually a poster child of island gigantism as well. You see, this wasn't some weird unique bird lineage. This was a pigeon, a giant overgrown one, but a pigeon nonetheless. Now, you might not be
Starting point is 00:02:27 able to guess that just by looking at it, but the dodo does in fact belong to the pigeon and dove family, Columbidae. But while your average pigeon weighs maybe 300 grams and spends his time defecating on statues, the dodo was 17.5 kilograms or 39 pounds of pure flightless pigeon, and in other words, 58 times heavier. It stood a little less than a meter or three feet tall, had wings that were basically decorative at that point, and a beak that had evolved from pecking seeds to mess around and find out. With one account saying word for word, their war weapon will as the mouth, with which they could bite fiercely. So you might be thinking, why would a pigeon, a bird so impressive in flying and geo-navigation
Starting point is 00:03:05 that they had been used as a communication method for over a thousand years, would just lose their ability to fly? And the answer is actually fairly simple. Mauritius, the island where they're from, has no native predators to worry about. And so the dodo simply had no reason to maintain the ability to fly, seeing that flying is metabolically expensive, requiring highly specialized structures and massive chest muscles. So the Dodo just stopped. It got fat, likely happy, and waddled around eating fruits and fallen seeds like it owned the place,
Starting point is 00:03:33 which to be fair, it kind of did. And so, the Dodo's entire evolutionary strategy was pretty much be big and be fearless, which worked great for millions of years until it didn't. You see, they were so unafraid that when Dutch sailors arrived in 1598, the Dodo's would literally just walk up to them to say hi, being their fat happy self. But then, uh, this proximity would also. allowed the sailors to club them to death if they so chose to, which, uh, they unfortunately did, a lot. And the last confirmed sighting was in 1662, less than a century after humans discovered
Starting point is 00:04:06 the island, with the dodo's going from ruling an island paradise to being extinct so fast that for years afterwards, some even thought the stories were false, and that they were instead mythical animals, which we now of course know they're not, and are one of the best known extinct animals worldwide. But while everyone knows about the dodo, almost no one seems to know about its neighbor, the Rodriguez Solitaire, scientifically known as Pezofap's Solitaria. And guess what? This wasn't just another giant giant flightless pigeon that lived in Africa, specifically on the Rodriguez Island, just 560 kilometers east of Mauritius, which also made it a relatively close cousin to the dodo. But here's the real kicker. It was even larger than the dodo. While the
Starting point is 00:04:49 dodo was more round and chunky, the solitaire was tall and lean, with male standing up to 90 centimeters or 35 inches tall, and weighing up to 28 kilograms or 62 pounds, making them over 50% bigger than even dodoes. And on top of that, the sexual dimorphism was insane, with males being up to 66% heavier than the females, with them topping out at 17 kilograms, which to put that into perspective would be like the average American man now weighing 227 pounds or 103 kilograms, and making it the most extreme size difference between sexes and any neognotic bird ever. But here's where things could get properly weird, or well, violent. While their wings, just like the Dodo, had become useless for flight, they had evolved to become useful for another purpose entirely,
Starting point is 00:05:33 chiefly as weapons. You see, both sexes had bony knobs in their wings that were the size of musket balls, being able to grow at 3.3 centimeters or 1.3 inches across, which in case you're not a war historian, would be around the size of a ping pong ball. And as alluded to, these were not just for show, as the solitaire would use these weaponized wings to beat the absolute H.E. double-hundred. hockey stick out of their rivals, swinging them so fast and hard that contemporary accounts claimed it made us sound like thunder. And fossil record certainly backs this up, with many solitaire wing bones showing signs of healed fractures, evidence of just how brutal these battles were. And while some have suggested that these fractures may be the result of a predatory bone disease rather than battle wounds,
Starting point is 00:06:15 all extant birds, where carpal spurs and knobs are present, have used them as weapons literally without exception. And this would also make sense, considering unlike their peace-loving cousins, the Rodriguez Solitaire evolved an island that received significantly less rainfall than Mauritius, meaning resources were scarcer, which likely put evolutionary pressure of becoming extremely aggressive. Oh, and they also had a wicked bite. But unfortunately, similar to the Dodo, they laid just one egg at a time, which isn't exactly great when it comes to species survivability. However, unlike the Dodo's extinction, the Solitaire lasted longer, but not by much, as by the Dodo's extinction. As a solitaire as by the mid-1700s, they were gone.
Starting point is 00:06:52 So another giant pigeon deleted from existence, except this one went down swinging its ping-pong ball fists, or rather wings. Now at this point, you're probably thinking that everything that becomes giant on an island is a bird. And you wouldn't exactly be wrong there, as there are plenty more examples of birds getting huge, even bigger than those I mentioned, which we'll get to later, but mammals also got their fair share of gigantification as well. And nowhere is this more obvious than with rodents,
Starting point is 00:07:17 as islands seemed of a particular talent for turning cute little mice and rats into absolute units that would make Tom and Garfield think twice. Take the Canary Islands, for example. These volcanic islands off the coast of Africa were once home to Canary Amis, Bravoi, the Tenerife giant rat. And these things weren't just big, they were huge, being about the size of Yorkshire Terriers. In fact, when we compare them to their closest mainland relatives, the African grass rat, we find that these guys got over five times bigger, despite only diverging 615,000. thousand years ago, which, just to put that in a perspective, is about the same amount of time of
Starting point is 00:07:51 divergence as Neanderthals and modern humans. And while Neanderthals are certainly absolute units, imagine if there are the 900 pounds or 400 kilogram type of absolute units, as that's basically what the Tenereve giant rat is to the grass rat. And then there's the saint killed a field mouse, Epodemus Silvaticus Hertensis, which is basically evolution's attempt at speed running in such giganticism. As what's interesting about these guys is that this isn't some ancient species that's had millions of years to get weird. In fact, it hasn't even had hundreds of thousands. This is a regular mouse that was brought to a wind-swept Scottish island, maybe a thousand years ago, tops, and possibly by Vikings, because of course, Vikings are involved somehow. And in just a
Starting point is 00:08:32 millennium, which in evolutionary terms is basically yesterday, these mice have grown significantly larger than their mainland relatives, all the while being on an island, which is basically Scotland's attempt at remaking Ireland. Just kidding. Being cold, wet, windy, and mostly grass. For these mice, paradise. No cats, no rats, no competition, just them, the green outdoors, and a thousand years to get progressively more chunky. However, with all this said, I will note that most cases of island gigantism do seem to happen in warmer environments. And if you were to for some reason become maroon on the island of Flores in Indonesia, let's just say, good luck, as this island seems to exist solely to make biologists question their sanity. And getting marooned
Starting point is 00:09:13 here would suck for multiple reasons. You see, this is the exact same place. where they found extinct humans, humans known as Homo Floresiensis, an extinct cousin of ours who actually coexisted with humans for a hot sec. But these were no giants, instead being essentially dwarves who barely stood over a meter tall, or three foot seven inches, experiencing something called island dwarfism, the second half of the island rule. And so if given a long enough time, perhaps your descendants would join them in short kingery, which didn't seem to fare well for our cousins. But even if you're only marooned for one generation, you're not out of the woods yet, as don't be mistaken in thinking this dwarfism applies to the rest of the animals as well.
Starting point is 00:09:51 As while humans went small, others went big, including, of course, in typical fashion, the rats. Meat, Papa Gomez, Armandville, also known as the Florist Giant Rat, which might sound like something out of a low-budget film, but is absolutely real and absolutely massive. As well, your average rat weighs maybe 300 grams, unless it's of the New York City variety, in which case all bets are off, the Florist Giant Rat weighs up to 2.5 kilograms. or 5.5 pounds. So massive, like I said. And why? Well, because why not? The largest carnivore on Flores is the monitor lizard too busy eating Kiryon to hunt a roided-up master splinter. But that's not to say they couldn't take them, as these monitor lizards are really
Starting point is 00:10:31 veronous Komodo-enzes, i.e. the Komodo dragon, the largest lizard on Earth. Now, for a long time, these guys have been considered a textbook example of island gigantism, seeing that they live on islands and are, well, giant, weighing up to 150-kilograms. or 330 pounds, and measuring up to 3 meters or 10 feet long. However, recent research has shown that these guys likely to send it from an already giant monitor lizard that evolved in Australia, which in turn means their size is through something called phyletic gigantism, which is basically when a whole lineage just trends toward becoming absolute units, as opposed to purely the island making it big.
Starting point is 00:11:08 But, and this is the important part, island life let it stay big. Everywhere else, giant monitor lizards went extinct, be it competent. from other predators, climate change, or just humans with pointy sticks. But on Flores, and a handful of other Indonesian islands, there are no big cats, no bears, no wolves, etc. So being a three-meter-long lizard with toxic drool and a monopoly on being terrifying is just perfect. And considering their origins in Australia, it might not surprise you to hear that there are islands here, which have also been inflicted with the insanity that is island gigantism. And when I say islands, I'm talking about New Zealand, which technically is an island part of the Australian continent.
Starting point is 00:11:46 continent. Now, New Zealand is basically what happens to you take an island, remove all mammals except bats, and then let evolution go off its medication, and their results are exactly as insane as you'd expect. No pun intended. Let's start with the living nightmare that is the giant weeta, which are specifically species in the genus Dianocreda. These things are basically what happens when my childhood nightmares meets reality, i.e. Giant crickets. And giant they are, with specimens being recorded to weigh up to 70 grams. In other words, heavier than your average sparrow, play twice, that is. Now, thankfully, they can't fly, and can barely jump, which is again because of how massive they are. So in other words, they're basically just large, scary potatoes with
Starting point is 00:12:26 legs. But despite their terrifying appearance, they're actually vegetarian, so the only thing you really have to worry about from them is a heart attack. Now with this said, the Wita is a small fry compared to what used to roam New Zealand, the Moas, especially the giant Moas, who evolved to fill the same niche as herbivorous mammals, except of course there were birds that stood up to 3.6 meters tall or 12 feet, and weighed up to 278 kilograms or 613 pounds. And in a very unusual case, not only were these guys just flightless and giant, but they actually had no wings, not even vestigial ones. There was no humorous, no radius, no ulna, and no carpels, with basically the entire upper limb being absent from skeletons. The only thing there was was a tiny
Starting point is 00:13:08 finger-sized scapula coracoid, a fused remnant of the forelims girdles coracoid and scapula. And I can't emphasize enough how unusual this is, because out of literally every other flightless bird, dead or alive, the Moas are the only ones completely lacking wings. So in other words, they were basically feathered giraffes that forgot there were supposed to be birds. But, despite their sizes, they were not the kings, as hunting these walking skyscrapers was Hiraeis Mure, better known as Hoss's Eagle. And let's just say, if you're hunting big bird's cousin, you better be big yourself. And, uh, they were. Not only. Only were they giant for an eagle, they are in fact the largest eagle that ever lived, period,
Starting point is 00:13:49 and could weigh up to 40 pounds or 18 kilograms, while having a wingspan reaching 10 feet or 3 meters. And while that might not sound huge, you have to keep in mind the fact that of the largest extent eagles, none have been verified to exceed 9 kilograms or 20 pounds in the wild, meaning even the largest are about twice as small as Hoss Eagles. And yet, wild eagles are that much smaller size can still kill deer, antelope, and sometimes even wolves, with their prey often weighing many times their size. And so unsurprisingly, these absolute units of an eagle were giant killers, having talons that were literally the size of tiger claws.
Starting point is 00:14:23 And they put those to good use, hunting prey the size of cows, likely diving at speeds that would let it strike with enough force to break bones. And based off of the Maori stories of the poakai, a monstrous bird from their legends and stories, these eagles likely turn these weapons against the human invaders, too, which entered New Zealand about 700 years ago. But unfortunately, these humans, humans prove too much in the end, leading to the extinction of the Moas, which in turn led to the
Starting point is 00:14:49 gradual extinction of the biggest eagle this planet has ever seen. But while the Moas and Haas' eagles are gone, New Zealand still has one absolutely ridiculous yet adorable bird, bumbling around. The Cacopo, scientifically known as Strygops, Abroptilus. And this guy isn't just ridiculous looking. It's like in typical island giganticism fashion, they are big, with them actually being the world's largest parrot, with males weighing up to 3 kilograms or 6.6 pounds, and measuring up to 64 centimeters or 25 inches long, meaning about twice the size of the next largest parrot, the hyacinth macaw. And beyond its size, it's basically everything a parent shouldn't be. It can't fly, it's nocturnal, and is the only parrot in the world that uses
Starting point is 00:15:30 a leck breeding system, which in case you don't know what that is, is basically equivalent to guys at a frat party, being a mating system where males gather in a specific region to quote-unquote display for females, who then choose a mate based on the best of these displays. And just like a frat party again, these guys smell, but perhaps a bit better. Being described as a combination of honey, papaya, which in case you didn't know, both tastes and smells like vomit, and I quote, musty violin cases. So certainly unique scent in any case. And the smell is actually so strong that predators can easily track them by scent alone from far distances, which is a terrible evolutionary strategy when you can't fly. But perhaps the only thing worse than that,
Starting point is 00:16:09 is what they do when they decide to breed. As you see, those displays I was talking about earlier basically consists of the Kakapo singing the song of its people to as many things as it can, or at least as long as it can distance-wise. What happens is that males create these elaborate bowl-shaped depressions in the ground, which basically act as acoustic amplifiers. And they then proceed to sit in these bowls
Starting point is 00:16:29 and produce a deep booming sound that's so low frequency that it can travel 5 kilometers or 3.1 miles through dense forests. And just as a cherry on top, they do this for 6 to 8 hours, every single night for up to four months, meaning 960 hours of booming per mating season. So they better hope it turns a binging with all that effort they're putting in, pun intended. But the ingenuity of the low frequency is also a problem, kind of. As to what the low frequency itself means it carries for longer,
Starting point is 00:16:56 it also makes it so that females cannot always accurately tell which direction it's coming from. So in other words, you basically have males crying their hearts out for their Juliet, while the females are just wandering around the forest like, where the heck is that coming from? And probably also how do I shut him the H.E. Double Hockey Stick up. And it gets worse, as at least some of the males are desperate enough during mating season to try mating with pretty much anything, including people's heads, whether being famous, or perhaps infamous, footage of a Kakapo named Sirocco,
Starting point is 00:17:25 attempting to mate with zoologist Mark Harwardine's head. Yeah. And since then, scientists have even built a special ejaculation helmet to help collect sperm from overly excited males, which can then be used in artificial insemination programs. And no, I'm not kidding. And ultimately, the Cacopo is so evolutionarily weird that it almost went extinct just from being bad at existing,
Starting point is 00:17:46 and of course from humans showing up with their pesky, pointy sticks. And by 1995, there were only 51 left, even though they can live up to 80 years, possibly more. But thankfully, a conservation program was then set up, which had the first success in years when it came to saving them. However, while it did keep them from going extinct, it wasn't as successful as one might hope. And as of 2024, there are only 244 Kakapo left,
Starting point is 00:18:10 with every single one of them being closely monitored and restricted to certain areas. Oh, and they also all have names. But anyways, considering the density of animals made giant around Australia and New Zealand, maybe there's just something in the waters of the Pacific that makes things grow huge. Because it's not just here. Take New Caledonia, for example, a French territory east of Australia. This place is home to Racodactylos, Lichianus. also known as the new Caledonian giant gecko, the largest gecko in the world.
Starting point is 00:18:38 And this thing certainly lives up to its title, being able to grow to 43 centimeters or 17 inches long, and weigh up to 500 grams, meaning it's a gecko about the size of a squirrel. And to really put that into perspective, your average house gecko weighs maybe 2 grams. So this guy is 250 times heavier. In fact, not only is the current largest gecko in the world, it is also the second largest of all time, only being surpassed by the gigarkanum, a species which funnily enough used to live in New Zealand, but actually does come from New Caledonia as well, with it having been possibly 50% longer and several times the weight.
Starting point is 00:19:13 And the New Caledonian giant gecko is so big that it routinely eats other lizards, birds, and even small mammals, having a strong enough bite and pointy enough teeth that it can absolutely hurt you if you piss it off. And that's kind of easy, considering they're known for being absolutely psychotic in the temperament department, with even their breeding behavior basically consisting of a first date where they bite each other and thrash violently, often accompanied with locking jaws. How cute. But hey, if they survive that, I guess that means they're faded. So unsurprisingly, these guys are highly territorial, and they communicate this through a series of growls, chirps, whimpers, and whistles. You said this place was steps from the water. We just haven't found the steps
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Starting point is 00:20:41 That's Indeed.com slash podcast. Terms and conditions apply. Need a hiring hero? This is a job for Indeed sponsored jobs. They sound more like they're coming from a, well, honestly, I have no idea, but certainly not a reptile. And when threatened, they often won't run. They will instead stand their ground, make funny noises, and probably fight you. And in fact, they're so aggressive that many cases of cannibalism have been noted, and they're generally chalked up to territorial defense. And like some of the other island giants we've talked about, these guys are also long-lived, being able to live for decades, with some individuals in captivity having reached 50 years old,
Starting point is 00:21:17 which on the flip side, a house gecko would be lucky to make it a seven. And on their native islands, indigenous Kanaq people actually fear them because of an old superstition, which is that the geckos can cling to your body and pull out your soul. And given their size, attitude, and those sounds, I'm not entirely convinced that's just superstition. But like I said, there must be something in the water of the Pacific, as it seems like the entire region is cursed with gigantism. As no matter where you go, you'll find islands scattered around with animals that have no business being that big. Take the Lord Howe Island stick insect, for example, also called the tree lobster, which probably tells you everything you need to know. This thing is as thick as your thumb and longer than your hand, being up to 20 centimeters or 8 inches long, and weighing 20,
Starting point is 00:21:59 25 grams or one ounce. So likely hundreds of times heavier than your run-of-the-mill stick insect. And what's crazy is that these things were actually thought extinct after rats were introduced in 1918. Would them be declared so just two years after? But then, decades later, scientists found a dead one on a sea stack known as Ball's Pyramid, which is basically a 500-meter-tall rock just jutting out of the ocean. And lo and behold, following a new expedition to look for them, a population of fewer than 30 individuals were found. Having survived in this vertical, basically barren rock face for 80 years, presumably out of pure spite. But as of 2012, the Melbourne Zoo is successfully bred over 9,000 of them, and thus taking them out at the brink of
Starting point is 00:22:38 extinction. And yes, obligatory it's over 9,000. Now I will mention, we're not exactly sure if this size is a result of insular gigantism, considering it has no closely related mainland relatives that we know of. So it's hard to say for sure, but let's just assume it is. And speaking of big animals without a spine, we can't forget about the King of Island Invertebrates himself. And really, the king of land invertebrates in general, Burgess Latro, i.e. the coconut crab. Now this thing is what I'd imagine what happens when Evolution asks, what if we made a crab, but like a horror movie version? And then doesn't wait for any input. Because first off, these things are huge, and I mean huge. We're talking over a meter or three feet across, and weighing over four kilograms
Starting point is 00:23:19 or nine pounds. In other words, more like a small dog with an exoskeleton rather than any normal kind of crap. Well, technically hermit crab, but still. And get this. nowhere is safe from these creatures. As despite being ground dwellers, these crabs made nightmare fuel can climb trees. Yes, trees, and up to 10 meters or 33 feet high at that.
Starting point is 00:23:39 But that is not all, because of course it isn't. Despite only weighing a fraction of the heaviest animals on land, they have the strongest recorded grip strength of any terrestrial animal period, with a crushing force up to 3,300 newtons, which for reference is about as strong as the lion's bite.
Starting point is 00:23:54 And just a reminder, this is again coming from a crab. well hermit crab and they use this power for exactly what you'd expect or at least what i'd expect take in names and kick him butt and by that i mean cracking open coconuts which really shouldn't be that surprising given their name and being a general menace to society as coconut crabs are notorious thieves with their nickname even being the robber crab or palm thief and they'll steal pretty much anything but they especially like shiny objects and there are even reports of them stealing knives from camps and apparently this applies to birds too as coconut crabs have been photographed dragging away full
Starting point is 00:24:27 grown seabirds, which were dead because they killed them. Yeah, vicious. So with all of this said, and having toured a fraction of the world's weirdest islands and meeting their oversized inhabitants, you're probably wondering, why does this keep happening? What is it about islands that make evolution turn David's into Goliaths? And as it turns out, there are actually several mechanisms at play here, and they all pretty much work together to synergistically create these island monstrosities. First, there's the predator problem, or rather the lack of a predator problem. You see, on the mainland, being small usually means you can hide better and need less food. But remove those predators, and suddenly being small is less useful. As without anything trying to murder you every five seconds,
Starting point is 00:25:05 you can afford to get bigger. And being bigger offers a bunch of benefits, including better thermoregulation, meaning you won't freeze to death as easily. And then there's the fact that you can eat food that smaller animals generally can't get or can't process. It also means you can store more tissue for when times get tough. But of course a lot of it is also driven by internal competition, as being bigger means you can fight off competitors for the best territories and mates, which thus snowballs into bigger and bigger offspring. And sometimes the change starts before natural selection even gets involved, with something called the Founder Effect,
Starting point is 00:25:36 which in this case is when a few individuals are able to better colonize an island in the first place, and thus their genetic quirks become the default setting. The island itself also matters, with smaller islands generally pushing species to more extreme changes quicker, as fewer species, limited resources, and isolated gene pool, crank up the evolutionary pressure and overdrive. But perhaps the most important factor of them all is the ecological release. You see, when you're on an island, entire ecological niches might be completely empty,
Starting point is 00:26:04 which results in the arrivals picking up niches that are already occupied on the mainland. For example, if there are no large herbivores, birds might become moas. No mammalian predators? Eagles become hoss eagles. No one competing for cocauts? Crafts become nightmare fuel. Now overall, it would seem that island gigantism is pretty much a uniformly good thing. considering the advantages it gives.
Starting point is 00:26:25 But that's not exactly the case, and here's where things get a bit depressing. You see, being a giant on the island is great, until it suddenly and catastrophically isn't. Island giants have one fatal flaw. Well, one big fatal flaw. They evolved in a bubble. No predators means less fear. Less competition means no competitive arms race. And no serious threat means less defense mechanisms beyond being big.
Starting point is 00:26:47 So when humans show up, and we always do, these giants basically become walking buffets with eat-me-science trapped to their backs. I mean, take a look at the Moas, gone within a hundred years. Haas Eagle? Starved shortly after. The Dodo and Solitaire deleted. The Tena Reef Giant Rat, gone. In fact, an overwhelming number of animals with insular gigantism
Starting point is 00:27:08 are either extinct or near-extinct, and this is likely a trend which will continue to happen for these island giants. But I will mention to something I alluded to, which is that the island rule doesn't have to make things big. It can also make big things smaller. And that is why the island of Floris, had both giant rats and tiny humans. But that is a topic for another video.
Starting point is 00:27:28 But regardless, the main takeaway is perhaps that islands make evolution act, well, weird. Give it isolation, remove some pressure, add some weird constraints, and suddenly you've got crabs that can climb trees and crack coconuts, insects the size of mice, and pigeons that forgot how to fly, and probably how to poop on statues as well. Thanks for watching, and until... Enjoy more ways to save at Ralph's, like low prices in every aisle. And when you download the Ralph's app, you can clip and save more with digital coupons every week.
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