Say that Fast Biters, T-Rexes, Belly Draggers, Spinosauurs, Gigantosaurus, Sharp Beaks, etc, were to join forces and attack the Great Valley together. Would the Combined Herd be able to fight off this Combined Pack?
I mean, true, their teamwork would help them, but what if the other side was Sharpteeth and also were skilled at teamwork too?