Tyrannosaurus rex Scavenged Duck-Billed Dinosaurs in Ancient Wyoming, Bite Marks Reveal

Thousands of fossilized bones from a Cretaceous-period bonebed in Wyoming, the United States, offer rare physical evidence that Tyrannosaurus rex fed on the carcasses of a duck-billed dinosaur species called Edmontosaurus annectens.

Thousands of fossilized bones from a Cretaceous-period bonebed in Wyoming, the United States, offer rare physical evidence that Tyrannosaurus rex fed on the carcasses of a duck-billed dinosaur species called Edmontosaurus annectens. “Identifying the origin of perforating lesions on fossil bone is often difficult, and many are considered tooth traces, in spite of more likely and more parsimonious etiologies,” said Loma Linda University paleontologist Bethania Siviero and colleagues said. “Much of this confusion stems from tooth trace criteria that are ambiguous when the context for the lesions is not considered.”

“Mistaken identification of tooth traces has led to misleading interpretations of animal behavior.” “Our study of tooth traces on fossil bones critically reviews previous criteria.” In their research, Dr. Siviero and co-