Na einiosaur hzoom
Einiosaurus is a large herd animal from North America.  It has a weird shaped horn that pointed down like a hook.  Male Einiosaurus would fight among each other for dominance of the herd or rights to a certain female.  Einiosaurus leaders are large older males.  He has first picks of females.  When predators would attack the herd they will do one of two things, one they will gather together to form a protective barrier against the large creatures or they will stamped, when this happens they will run over or escape from the predator.