TRUE-pachycephalosaurs have a frill, or margin of bone that protrudes off the back of the skull.
Pachycephalosaurs, which means "thickheaded lizard" in Greek, was a small family of dinosaurs with an astonishingly high entertainment value. The skulls of these two-legged herbivores ranged from faintly thick to truly dense (in later genera like Stegoceras). It is popular for having a bigger, bone dome a top its skull which was up to 25 cm (10 in) thick and sheltered its tiny brain. The skull was short and had large, rounded eye sockets that faced forward, indicating that the animal had good eyesight and could see in both directions. Pachycephalosaurus had a short muzzle and a pointed beak. The teeth were tiny, with crowns shaped like leaves.
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