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T. rex mass death site, the first in the southern United States, discovered at the Utah monument


The Tyrannosaurus rex may not have been as lonely as we thought.

In a groundbreaking discovery of the first T. rex mass death site in the southern United States, announced Monday by the Utah Bureau of Land Management, scientists found evidence of pack behavior among the famous ancient predator in the Grand Staircase-Escalante National Monument.

“The new Utah site adds to the growing body of evidence showing that tyrannosaurs were large, complex predators capable of social behaviors common to many of their living relatives, the birds,” said Dr. Joe Sertich, curator of dinosaurs at the Denver Museum of Nature and Science.

“This finding should be the tipping point to reconsider how these large carnivores behaved and hunted in the northern hemisphere during the Cretaceous.”

T. rex mass death site, the first in the southern United States, discovered at the Utah monument

In the past, paleontologists have long debated whether huge dinosaurs lived and hunted alone or in groups.

However, along with other findings of pack formations in Alberta, Canada, and Montana, the Utah find may fossilize the belief of a social T. rex.

In the Canadian discovery, 12 individuals found over 20 years ago by Dr Philip Currie, many scientists doubted T. rexes had the brain to organize itself into something complex and thought it was ‘an isolated case. The Montana site was based on social theory, but now this third site can bring more certainty to the idea.



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