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Terrifying Tyrannosaurs were social creatures who hunted together like wolves, new research says

Terrifying Tyrannosaurs were social creatures who hunted together like wolves, new research says

When we think of what a Tyrannosaurus looked like, we picture a gargantuan dinosaur with a huge mouth, formidable legs and tail, and inexplicably tiny arms. When we picture how it behaved, we might imagine it stomping and roaring onto a peaceful scene, single-handedly wreaking havoc and tearing the limbs off of anything it can find with its steak-knife-like teeth like a giant killing machine.

The image is probably fairly accurate, except for one thing—there's a good chance the T. rex wouldn't have been hunting alone.

New research from a fossil-filled quarry in Utah shows that Tyrannosaurs may have been social creatures who utilized complex group hunting strategies, much like wolves do. The research team who conducted the fossil study and made the discovery include scientists from the U.S. Bureau of Land Management, Denver Museum of Nature and Science, Colby College of Maine, and James Cook University in Australia.

The idea of social Tyrannosaurs isn't entirely new—Canadian paleontologist Philip Curie floated the hypothesis 20 years ago upon the discovery of a group of T. rex skeletons who appeared to have died together—but it has been widely debated in the paleontology world. Many scientists have doubted that their relatively small brains would be capable of such complex social behavior, and the idea was ridiculed by some as sensationalized paleontology PR.


However, another mass Tyrannosaurus death site found in Montana lent scientific credence to the theory, and now the Utah discovery has provided even more evidence that these massive creatures weren't solitary predators, but social hunters.

"The new Utah site adds to the growing body of evidence showing that Tyrannosaurs were complex, large predators capable of social behaviors common in many of their living relatives, the birds," said Joe Sertich, curator of dinosaurs at the Denver Museum of Nature & Science. "This discovery should be the tipping point for reconsidering how these top carnivores behaved and hunted across the northern hemisphere during the Cretaceous."

The Utah site, known as the Rainbows and Unicorns Quarry (yes, really), has provided paleontologists a wealth of fossils since its discovery in Grand Staircase-Escalante National Monument in 2014. Such sites are rare, and the findings in them are often difficult to interpret.

"We realized right away this site could potentially be used to test the social Tyrannosaur idea. Unfortunately, the site's ancient history is complicated," said U.S. Bureau of Land Management paleontologist Dr. Alan Titus. "With bones appearing to have been exhumed and reburied by the action of a river, the original context within which they lay has been destroyed. However, all has not been lost."

Researchers used a multi-disciplinary approach, examining the physical and chemical evidence to determine that a group of 12 Tyrannosaurs at the Utah site were likely killed during a flood that washed their remains into a lake. "None of the physical evidence conclusively suggested that these organisms came to be fossilized together, so we turned to geochemistry to see if that could help us," said Dr. Celina Suarez of the University of Arkansas. "The similarity of rare earth element patterns is highly suggestive that these organisms died and were fossilized together."

The Tyrannosaurus fossils are dated at 76.4 million years old. The research team has also found fossils from seven species of turtles, multiple fish and ray species, two other kinds of dinosaurs, and a nearly complete skeleton of a juvenile (12-foot-long) Deinosuchus alligator.

It's always a fun day when we find out one of history's most terrifying creatures is even more terrifying than we believed. One Tyrannosaurus sounds scary enough, but a group of them strategizing to hunt? That's definitely worse, like a coordinated troupe of Godzillas. No thanks, Cretaceous Period. We're good here.

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