(pronounced or-ni-THISS-key-an ) Ornithischian (bird-hipped) dinosaurs were herbivoroud dinoaurs that had hoof-like claws. Some ornithischians include the Ornithopods (Fabrosaurs, Hadrosaurs, Hypsilophodontids, Iguanodontids, Camptosaurids), Thyreophorans (Ankylosaurids, Stegosaurids), and Marginocephalians (Ceratopsians, Pachycephalosaurs).