Pachycephalosaurus had a thick, bony, dome-shaped head that it may have used in head-butting or shoving matches.
Pachycephalosaurus had a thick, domed skull up to 25 centimetres thick.
Pachycephalosaurus (meaning 'thick-headed lizard') was a herbivore that lived during the Late Cretaceous in what is now North America — had a dome of bone up to 25 cm thick.
Pachycephalosaurus had a thick, bony, dome-shaped head.
Pachycephalosaurus may have used its head in shoving matches.
Pachycephalosaurus means 'thick-headed lizard'.
Pachycephalosaurus had a dome of bone up to 25 cm thick.
Pachycephalosaurus had a thick bony dome on its head.