Pachycephalosaurus

Pachycephalosaurus was a herbivore that lived during Late Cretaceous (70-66 million years ago). Discovered in 1860 by the american geolologist Ferdinand Vandiveer Hayden it remains one of the best-known dinosaurs. Almost all Pachycephalosaurus were found in Hell Creek formation (USA). A lot of people don't spell his name right and that mistake was found in Jurassic World too.

Pachycephalosaurus belongs to the Ornitischia order and has only one specie Pachycephalosaurus wyomingensis. His name means thick-headed lizard for his strange-looking skull. It was very thick. It had several cousins like Stygimoloch and Zalmoxes. Pachycephalosaurus best-known feture was his thick skull. The skull grew to 25 centimeters. Pachycephalosaurus used the head to fight with the other Pachycephalosaurus. But his skull was empty from inside to reduce the wight of the body.Pachycephalosaurus had a length about 4.5 meters and weighted about 450 kilos. It was aggressive with his own kind, so we think Pachycephalosaurus did knew how to fight. It had a normal grew, but we have to study more in this direction because there aren't so many juvenile skeletons found. During the grew the horns became in smaller proportion with the body. His legs were thick and the tail was heavy to balance the body. It had a binocular vision but, not as great as ours. We don't have a lot information about feeding, but from the small ridged teeth we think it ate leves seeds and fruits.