There are both Pachycephalosaurs
Stegoceras was created in 1902.
No, it does not!
A Stego-breakas!
Pachycephalosaurus would win, it could easily slam the Velociraptors to the ground.
they use their rooof horn as proection.
Yes, pachycephalosaurus is a noun, a singular, common, concrete noun; a word for an extinct dinosaur, a word for a thing.
Baby pachycephalosaurus were hatched from eggs laid by their parents. The parents would create nests to protect the eggs until they hatched. Once they hatched, the baby pachycephalosaurus were on their own to fend for themselves.
caves and swamps
Probably not
Joseph Leidy in 1853.
Pachycephalosaurus
It was a dinosaur that lived in what is now North America during the Late Cretaceous Period