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.
Pachycephalosaurus are o boltă mare şi groasă pe cap, şi are câteva proeminenţe mici pe spatele capului, şi are câteva chestii noduroase deasupra nasului.