Page 98 - The Dinosaur Book and Other Wonders of the Prehistoric World (DK-Smithsonian)

Pachycephalosaurs

Numerous small
spikes lined the head,
The age of dinosaurs Homalocephale Pachycephalosaurus
snout, and cheeks.
Acrotholus

The bony shelf was a
distinctive feature of all
pachycephalosaurs.
Stegoceras
Discovered in Canada
in 2013, Acrotholus was
about 6 ft (1.8 m) long.
The big eye sockets
indicate that these
The long horns may
have been for display dinosaurs had
rather than fighting. good vision.

Stygimoloch

The sharp beak was
used to gather leaves,
fruit, and possibly insects.

Dracorex

Small hands
were useful for
collecting food.

Also known as “boneheads,” referring and ringed with small, bony spikes. It is likely
to their incredibly thick, strong skulls, that the strong skull protected the animal’s brain
pachycephalosaurs were unusual-looking from regular impact inflicted during fights with
dinosaurs. The largest of the boneheads was rivals over status. But not all pachycephalosaurs
Pachycephalosaurus. Its skull alone, the had the same skull form. The smaller
96 biggest so far, was up to 16 in (40 cm) thick Homalocephale had a flat-topped head,

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