75-Million-Year Tyrannosaur Bite Marks Reveal Cannibal Scavenging

A 75-million-year-old tyrannosaur foot bone from Montana bears 16 precise bite marks made by a smaller tyrannosaur, indicating cannibalistic scavenging on a larger relative. Using high-resolution 3D scans and a systematic bite-mark classification, researchers conclude the carnivorous dinosaurs sometimes fed on conspecific remains, even late in decay, offering new insight into tyrannosaur behavior.