A gregarious quadrupedal herbivorous dinosaur of a group found in the Cretaceous period, including triceratops. It had a large beaked and horned head and a bony frill protecting the neck.
- Infraorder Ceratopsia, order Ornithischia.
- Within dinosaur families that had relatively similar body types, such as the hadrosaurs (duck-billed dinosaurs) or ceratopsians (such as Triceratops), there is an incredible range of diversity.
- An alternate view, that ceratopsians and pachycephalosaurs diverged from ornithopod dinosaurs in the Late Jurassic, is more consistent with the preserved biostratigraphic evidence.
- The ornithischians (‘bird-hipped’ dinosaurs) are herbivores, and include the plated Stegosaurus, the armored Ankylosaurus, horned ceratopsians, and duck-billed hadrosaurids.
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