Mosasaur

mosasaurs lived in the late cretaceous epoch of the mesozoic era (250-65 MYA). descended from terestrial lizards called agialasaurs. thy were monstrous eating pleisiosaurs,smaller mosasaurs,bony fish, sharks, sea turtles and sea birds. nothing rivaled them. it would have to ambush it's prey getting in stricking distance. it had to be quick grabing it before it swam away.