Pachycephalosaurus wyomingensis (meaning "thick-headed lizard") is a genus of pachycephalosaurid dinosaur that lived at the Late Cretaceous period, 66 million years ago. Pachycephalosaurus means thick-headed lizard, because it had a bony dome on its skull. It used its skull for fighting donimants, hurting predators, and mating.
Discovery and Naming
Pachycephalosaurus was discovered in hell creek foundation in the year 1931, it was the first pachycephalosaur ever to be discovered and described. It was thought to be an outdated troodon, but now we know that it was a plant eating dinosaur with a beautiful domed head.
Pachycephalosaurus is the largest member of the Pachycephalosaurid family and its cousins are Dracorex, Homalocephale, Microcephale, Prenocephale, Stegoceras, Stygimoloch, and Wannanosaurus. All species had dome-shaped heads and walked on two legs.