 Tyrannosaur tooth marks are the most commonly preserved feeding traces of carnivorous dinosaurs . They have been reported from ceratopsians , hadrosaurs and other tyrannosaurs . Tyrannosaurid bones with tooth marks represent about 2 % of known fossils with preserved tooth marks . Tyrannosaurid teeth were used as holdfasts for pulling meat off a body , rather than knife @-@ like cutting functions . Tooth wear patterns hint that complex head shaking behaviors may have been involved in tyrannosaur feeding . 
