sentences:  There is plentiful evidence for gregarious behaviour among herbivorous dinosaurs, including ceratopsians and hadrosaurs.However, only rarely are so many dinosaurian predators found at the same site.Small theropods like "Deinonychus", "Coelophysis" and "Megapnosaurus" ("Syntarsus rhodesiensis") have been found in aggregations, as have larger predators like "Allosaurus" and "Mapusaurus".