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For example, Heterodontosaurus tucki.
A pachycephalosaurid is a member of the Pachycephalosauridae, a clade of ornithischian dinosaurs.
A camptosaurid is a member of the Camptosauridae, a group of plant-eating, beaked ornithischian dinosaurs of the Late Jurassic period.
Triceratops was a ceratopsian, or a horned, herbivorous dinosaurs with a frill. Ceratopsians were a type of Ornithischian, or bird hipped, dinosaur.