Pachycephalosaurus has a big, thick dome on its head, and it's got some little bumps on the back of its head, and it's got a bunch of gnarly things on the end of its nose.
Pachycéphalosaure a un gros dôme épais sur sa tête. et il a des petites bosses sur l'arrière de sa tête, et il a une grappe de trucs noueux au bout de son nez.