About ornithischians

There were five main groups of ornithischians. They were all herbivores with hoofed feet and hipbones arranged like modern birds. They also had beaked mouths, apart from those in the pachycephalosaur group. Ornithischians were either bipedal or quadrupedal. Bipedal ornithischians had stiffened tails to counterbalance their bodies while feeding or running.

Pachycephalosaurs

Ceratopsians

Five groups

The five groups of ornithischians were: ceratopsians, with their neck frills; ankylosaurs, with their body armor; pachycephalosaurs, with their domed heads; stegosaurs, with their back plates, and the birdlike ornithopods.

Five groups

The five groups of ornithischians were: ceratopsians, with their neck frills; ankylosaurs, with their body armor; pachycephalosaurs, with their domed heads; stegosaurs, with their back plates, and the birdlike ornithopods.

Ceratopsians

Stegosaurus Anatomy

Stegosaurus The skeleton of Stegosaurus shows the more advanced omithischian hipbone. An extra forward-pointing prong had developed in addition to the backward-pointing pubis bone.

Eye socket

Eye socket

Stegosaurus skull The skull of Stegosaurus was long and narrow. It had a toothless beak and small cheek teeth for chewing vegetation.

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