A 75-million-year-old fossil reveals a shocking tyrannosaur secret

Tyrannosaurs may be famous as fearsome apex predators, but new research reveals a more opportunistic-and slightly grim-side to their behavior. Using high-resolution 3D scans, a researcher identified precise bite marks on a massive tyrannosaur foot bone, showing that a smaller tyrannosaur had fed on the remains of a much larger relative over 75 million years ago.