The Cerapods are only a group you must have in the dinosaur "family tree". The definition of a Cerapoda is too complicated to have only one group and because of that there are a lot of under-groups, because of the many different dinosaurs. The dinosaurs under this group are the duck-billed dinosaurs, the rhino-like dinosaurs, the thickheaded dinosaurs and a dinosaur with feet’s like a bird. Therefore is the group divided into two under-groups, the Marginocephalias and the Ornithopods.

CERAPODS
The cerapods (or cerapoda) were a group of ornithischian (bird-hipped) dinosaurs that included the ornithopods and the marginocephalians.