Page 99 - The Dinosaur Book and Other Wonders of the Prehistoric World (DK-Smithsonian)

The flat-topped skull was not Prenocephale had
well adapted to withstand impact. a rounded, sloping head.

Prenocephale
Homalocephale

Pachycephalosaurus

The long and
powerful hind legs
supported the
dinosaur’s weight.

Only a
skull of THICK-SKULLED
Pachycephalosaurus
has been The top of the skull The skull of Pachycephalosaurus
was solid bone. was 20 times thicker than
discovered. other dinosaur skulls and
cushioned a relatively
small brain. The bone often
has evidence of damage,
supporting the theory that they
may have used their skulls for
head-butting combats.

and Stygimoloch had a small dome with much were probably fast, agile animals. The fossils
longer horns. But some scientists think these also show that they had leaf-shaped teeth like
smaller animals are just younger specimens other plant-eating dinosaurs and sharp, pointed
of Pachycephalosaurus. Even though the fossil teeth at the front of their jaws, suggesting
remains of these dinosaurs are very rare, enough that they may have eaten a variety of
have been found to show that pachycephalosaurs plant and animal food. 97

US_096-097_Pachycephalosaurs.indd 97 24/04/18 5:47 PM