There are both Pachycephalosaurs
Stegoceras was created in 1902.
No, it does not!
A Stego-breakas!
they use their rooof horn as proection.
Pachycephalosaurus would win, it could easily slam the Velociraptors to the ground.
Yes, pachycephalosaurus is a noun, a singular, common, concrete noun; a word for an extinct dinosaur, a word for a thing.
Probably not
caves and swamps
in a egg
Joseph Leidy in 1853.
Pachycephalosaurus
It was a dinosaur that lived in what is now North America during the Late Cretaceous Period