Pachycephalosaurs are a group of ornithischian dinosaurs that are known for their thick heads and debatable diets. Pachycephalosaurs appeared at the end of the Cretaceous period and died out at the end of the Mesozoic Era.
Pachycephalosaurs are a group of ornithischian dinosaurs that are known for their thick heads and debatable diets. Pachycephalosaurs appeared at the end of the Cretaceous period and died out at the end of the Mesozoic Era.
Pachycephalosaurs are a group of ornithischian dinosaurs that are known for their thick heads and debatable diets. Pachycephalosaurs appeared at the end of the Cretaceous period and died out at the end of the Mesozoic Era.