triceratops is a herbivorous dinosaur species that lived in north america about 68-65 million years ago. it is one of the last dinosaur species that lived until the great catastrophe, at the end of the cretaceous period, when many living things disappeared.
entelodont, (family entelodontidae), any member of the extinct family entelodontidae, a group of large mammals related to living pigs. entelodonts were contemporaries of oreodonts, a unique mammalian group thought to be related to camels but sheeplike in appearance. fossil evidence points to their emergence in the middle eocene(some 49 million to 37 million years ago) of mongolia. they spread across asia, europe, and north americabefore becoming extinct sometime between 19 million and 16 million years ago during the early miocene epoch.