Welcome to brain Stuff production of I Heart Radio. Hey brain Stuff, Lauren Vogebaum here with a classic episode from the archives. This is a fun one for me. I think I mispronounced the names of a few dinosaurs, but I was excited because I was talking about dinosaurs, and specifically about velociraptors. In this episode, we answered the surprisingly complex question of whether they really hunted in packs the way that we see in the movies. Hey there, brain Stuff,
Lauren Vogebaum here. Whoever the human stars of the latest Jurassic Park movie are the velociraptors are the fan favorite performers. Packs of raptors can gang up on anyone or anything, from kids in kitchens to a hybridized dino monster. Their tax are organized, strategic, and in most of the movies they rely on a chain of command within the group. But is such team oriented behavior supported by the fossil record. Before we can answer that question, we should clear something up.
The dinosaur that's called velociraptor in the Jurassic Park movies and novels was based on a completely different animal known as Dano NICUs, and when it comes to size, there's a huge gap between the two Velociraptor wasn't much bigger than a turkey, but the adult dano Niicus measured eleven feet or about three point three meters long, and may have weighed more than two hundred pounds. That's both are classified as Dromaeosaurids, a family of bird like carnivorous dinosaurs.
Members of this group had a specialized toe on each foot, which famously was held in an upright position while they walked. In theory. That habit kept the large hook shaped claws on those digits nice and sharp. Historically, it was thought that these claws were slashing tools used to disembowel prey, but recent studies have found that the claus would have been better equipped for stabbing or puncturing Dromosaurus. Therefore, it might have used their remarkable toes to help them cling
on to large thrashing victims. Think of this as sort of a prehistoric rodeo. Getting back to dano Niicus, This particular dinosaur was originally discovered in nineteen thirty one in Montana, but it wouldn't be named until nineteen sixty nine. That's when Yale paleontologist John Ostrom was overseeing a dig at a Montana quarry, and the bones of four dino nikus were found strewn around the partial skeleton of a much
larger herbivore called Tanantosaurus. Late in his career, Ostrom compared this paleocrime scene to a wolf pack dispatching its prey. The four dead dino Nikus, dinos he theorized had been killed while attacking the big plant eater in a coordinated group effort. Later, other members of their pack presumably killed that tenacious dinosaur. Ostrom's work influenced author Michael Crichton, who wrote pack hunting Dromaeosaurus into the first Jurassic Park book.
The concept has since taken hold of the public's imagination. Moreover, it's had a significant impact on dinosaurs science. Therapods, the group containing birds and all known extinct carnivorous dinos, are often found fossilized in close proximity to other members of their own species. Because of this, it's argued that plenty of non dremaosaur predators like Tyrannosaurus and allosaurs might have hunted in packs too, but then again, perhaps they didn't.
In a two thousand seven paper, paleontologists Bryan Roach and Daniel Brinkman dissected the issue at length, and in their opinion, neither Dana Nikeus, nor velociraptor, nor any other non avian predatory dinosaur would have formed packs. Via email, Brinkman explained, mammal like cooperative pack hunting is an extremely rare and
complex behavior, so let's talk terminology. Brinkman and Roaches paper defines true cooperative pack hunting as a group effort carried out by animals that habitually worked together with others of their species to capture and subdue prey too large for an individual predator to kill alone. Furthermore, these team players also defend their territory collectively and may share youngster rearing duties.
No living bird or reptile fits the criteria. It's true that nile crocodiles sometimes gang up on big mammals like wildebees, but they later disperse, and although Harris hawks have been known to form hunting parties of up to nine birds, they target small game while doing so. That said, there is one living animal that, according to Roached Brinkman, might offer us some insight into how Dramosaurus and other non avian therapods behaved. Around big prey items. The Komodo dragon.
Komodo dragons are solo hunters and effective ones at that an adult can bring down victims ten times its own body weight. These reptiles are also eager scavengers, and when one of them kills a large prey item, others are likely to come running. What follows is a gruesome feeding frenzy with a dozen or more commodo dragons mobbing the carcass. Such meetings get violent fast. While squabbling over a corpse, komotos may attack one another. Sometimes they even kill and
eat their smaller competitors at the site. So when paleontologists find a large collection of therapod bones and or teeth in the same fossil deposit, what should they make of it? Should they interpret the remains like a wolf style family unit, or should they be viewed as the site of a disorganized mob where side squabbles and cannibalism would have been rampant. For their part, Brinkman and Roach find the latter scenario
more probable. Brinkman said Dina, nikes and other non avian therapods were most likely solitary hunters who engaged in antagonistic Komodo dragon like feeding aggregations, and they interacted with each other in ways that were much more contentious, combative, and cannibalistic than has been widely believed. Okay, but what about dinosaur footprints? Can they shed any light onto the pack
hunting debate. In two thousand and seven, a hundred and twenty million year old drmaosaur trackway was discovered in China. Six different sets of parallel tracks were found, each made by an animal standing about four feet or one point two meters tall at the hip, and judging by the nature of the sediment, it looks like these prints were all laid down within a very short span of time.
Anthony J. Martin, a leading paleo ichnologist a trace fossil scientist, thinks the animals who made them were traveling in some kind of group. He said via email. The trackways showed these drmaosaurs were moving at about the same pace, in the same direction parallel, and spaced more or less the same distance apart. So I'm fairly certain that this is evidence of group behavior. Still, this doesn't necessarily mean the dromosaurs hunted in packs. Maybe they were rushing toward a
dead body like those independently minded Komodo dragons. In order to confidently cite any footprint assemblage as the product of pack hunting or a similar activity, would need, said Martin, more evidence, such as tracks of a prey animal that was clearly preceding them and not by much time. Best of all would be the dromosaur tracks ending at a
kill site and acknowledgist can dream right. Today's episode was written by Mark Mancini, whose name I also original name is pronounced, and produced by Tristan McNeil and Tyler Klang. For more on this and lots of other topics because at how stuff works dot com. Brain Stuff is produce action of I Heart Radio or more podcasts to my heart Radio, visit the I heart Radio app, Apple Podcasts, or wherever you listen to your favorite shows. H