A boy looking inside the skull of a Tyrannosaurus rex replica. Thomson Reuters

New evidence suggests that tyrannosaurs hunted as a pack animal.

The dinosaur remains were found in the Grand Staircase-Escalante National Monument in Utah.

Scientists had previously thought that the tyrannosaurs’ brains were too small for this kind of complex behavior.

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Tyrannosaurs were probably social animals who hunted in packs, according to research from the University of Arkansas published Monday.

The research challenges a common theory that the huge lizards were solitary hunters who chased down prey alone, perhaps because they were too stupid to cooperate.

The tyrannosaur category includes the famous Tyrannosaurus rex as well as similar-looking carnivores likes the Albertosaurus and Gorgosaurus.

“A lot of researchers feel like these animals simply didn’t

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