Pachycephalosaurus (/ˌpækɪˌsɛfələˈsɔːrəs/;[2] meaning "thick-headed lizard," from Greek pachys-/παχύς- "thick", kephale/κεφαλή "head" and sauros/σαῦρος "lizard") is a genus of pachycephalosaurid dinosaurs. The type species, P. wyomingensis, is the only known species. It lived during the Late Cretaceous Period (Maastrichtian stage) of what is now North America. Remains have been excavated in Montana, South Dakota, Wyoming and Alberta. It was a herbivorous creature which is primarily known from a single skull and a few extremely thick skull roofs, at 9 inches thick. More complete fossils have been found in recent years. Pachycephalosaurus was one of the last non-avian dinosaurs before the Cretaceous–Paleogene extinction event. Another dinosaur, Tylosteus of western North America, has been synonymized with Pachycephalosaurus, as have the genera Stygimoloch and Dracorex in recent studies.[3][4] Like other pachycephalosaurids, Pachycephalosaurus was a bipedal herbivore with an extremely thick skull roof. It possessed long hindlimbs and small forelimbs. Pachycephalosaurus is the largest-known pachycephalosaur. The thick skull domes of Pachycephalosaurus and related genera gave rise to the hypothesis that pachycephalosaurs used their skulls in intra-species combat. This hypothesis has been disputed in recent years.
Pachycephalosaurus
Prehistoric Creatures
for Prehistoric Creatures in Terra Nova: Season 2
Suggested by jpstudios11
He revealed there would be "intelligent dinosaurs" on the Badlands and the Phoenix Group that went there would be massacred by those creatures. The show would also have gone in a darker direction, with Taylor starting to go crazy and Jim Shannon having to step up into a leadership position. Until then Jim Shannon's friend from the future Nicholas Mason has been time traveling to the Prehistoric Past with his companions to encountered the dinosaurs like Carnotaurus, Brachiosaurus, Ankylosaurus, Acceraptor, Ovosaurus, Empirosaurus, Allosaurus, Triceratops, Parasaurolophus, Alamosaurus, Howler, with new ones like Dakotaraptor, Thescelosaurus, Struthiomimus, Leptoceratops, Oviraptor, Velociraptor, Shuvuuia, Protoceratops, Acheroraptor, Pectinodon, Quillmesaurus, Austroraptor, Saltasaurus, Noasaurus, Aucasaurus, Centrosaurus, Dracorex, Stygimoloch, Pachycephalosaurus, Pachyrhinosaurus, Corythosaurus, Ornithomimus, Edmontonia, Edmontosaurus, Torosaurus, Nanotyrannus, and even the fearsome Tyrannosaurus Rex. and the flying reptiles like Malcomus Pterosaur, Pteranodon, and Quetzalcoatlus, water reptiles such as Elasmosaurus, Toxochelys, and Tylosaurus, land reptiles like Champsosaurus, Notosuchus, Borealosuchus, Baselimys, Dinilysia, and Palaeoswania, with prehistoric fishes like Xiphactinus, and Sailfish, primitive birds like Ichthyornis, and Hesperonis, and then the mammals Deltatheridium, Didelphodon and Cimolestes
