First Children Encyclopedia

(Marvins-Underground-K-12) #1

Where did Pachycephalosaurus live?


Age of the dinosaurs


Many male animals


today compete to win


a mate. Stags crash their


antlers together, while


birds display colourful


feathers. Scientists


believe dinosaurs


had to compete in


similar ways.


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What did they do?


Dinosaurs may have used their


head crests to show off,


just like a peacock uses


its colourful tail feathers.


Courtship displays tell
females which males
are strong and likely to
make healthy young.

Bone head


Pachycephalosaurus’s head was


80 cm (2.5 ft) long. The dome


was made of solid


bone as thick as


a bowling ball.


Pachycephalosaurus
skull

Fighting fit


During the breeding season, male
Pachycephalosaurus may have butted
each other in fights over females. Their
backbones were adapted to
absorb shock.

This dinosaur had
bony spikes on its
head and snout.

Pachycephalosaurus

Corythosaurus

Peacock

188

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