Length - 7-10 feet (2-3 m) long
|WHEN IT LIVED||
Late Cretaceous period, about 68-65 million years ago
|WHERE IT LIVED||
Fossils have been found in Montana and Wyoming, USA, North America.
Stygimoloch is known from 5 partial skulls.
Stygimoloch was a thick-skulled plant-eating dinosaur (a pachycephalosaur) that walked on two legs. This unusual-looking dinosaur had bony spikes and bumps on its skull; the many horns ranged up to 4 inches (100 mm) long. Pachycephalosaurs probably engaged in head-butting both as a defense and as intra-species rivalry.