Physical Description Pachycephalosaurus is an ornithischian dinosaur with a unique overall morphology. The centerpiece is an exceptionally thick skull roof, up to 22 centimeters thick.

Pachycephalosaurus wyomingensis was the largest of the pachycephalosaurids—"thick-headed dinosaurs"—which featured extremely thick skullcaps. The top of a Pachycephalosaurus skull could be 9 ...

Vegetarian dinosaur may have actually eaten meat, skull suggests Steak knife-like teeth in the most complete Pachycephalosaurus jaw ever found look suspiciously like those of a carnivore.