 A young specimen of the Dinosaur Park Daspletosaurus species ( TMP 94 @.@ 143 @.@ 1 ) shows bite marks on the face that were inflicted by another tyrannosaur . The bite marks are healed over , indicating that the animal survived the bite . A full @-@ grown Dinosaur Park Daspletosaurus ( TMP 85 @.@ 62 @.@ 1 ) also exhibits tyrannosaur bite marks , showing that attacks to the face were not limited to younger animals . While it is possible that the bites were attributable to other species , intraspecific aggression , including facial biting , is very common among predators . Facial bites are seen in other tyrannosaurs like Gorgosaurus and Tyrannosaurus , as well as in other theropod genera like Sinraptor and Saurornitholestes . Darren Tanke and Phil Currie hypothesize that the bites are due to intraspecific competition for territory or resources , or for dominance within a social group . 
