It looks like you're new here. If you want to get involved, click one of these buttons!
The discovery of a pair of fossilized skulls from dome-headed dinosaurs is shedding light on how these bizarre creatures called pachycephalosaurs evolved, researchers say. The location of these skulls ? in the southern Mountain states ? indicates that pachycephalosaurids may have diversified in the south before they moved north and gave rise to the pachycephalosaur known as Stegoceras, said study lead researcher David Evans, an associate professor in the Department of Ecology and Evolutionary Biology at the University of Toronto. Pachycephalosaurids (which means "thick-headed lizards") were bipedal, herbivorous and possibly head-butting dinosaurs