 There is limited evidence of social behavior among the tyrannosaurids . For example , the " Sue " T.-rex specimen apparently died from a massive bite to the head , which could only have been inflicted by another tyrannosaur . Researchers reported that a subadult and a juvenile skeleton were found in the same quarry as the " Sue " specimen , which has been used to support the hypothesis that tyrannosaurs may have lived in social groups of some kind . While there is no evidence of gregarious behavior in Gorgosaurus , there is evidence of some pack behavior for Albertosaurus and Daspletosaurus . 
