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Pachycephalosaurus facts for kids

Pachycephalosaurus, the thick-headed lizard, had a dome of solid bone on its head. Find out whether it head-butted, what it ate, and test yourself with a quick quiz.

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Meet Pachycephalosaurus

Its name means thick-headed lizard. The top of its skull was a tall dome of solid bone. The dome was ringed by spikes and bumps.

It walked on two legs. Estimates of its length differ, from about 3 to 5 metres.

Did it head-butt?

Pachycephalosaurus had a dome of solid bone on its head. Scientists have long argued about whether it head-butted. Some scientists think it took part in head-butting contests. Others are not so sure.

What did it eat?

Probably plants, though scientists are not certain.

When did it live?

At the very end of the Cretaceous period, about 69 to 66 million years ago, in what is now North America. It lived at the same time and in the same place as T. rex, Triceratops and Ankylosaurus.

Pachycephalosaurus in a nutshell

Quick quiz: Pachycephalosaurus

Try these, then tap Show answer under each one.

  1. What does the name Pachycephalosaurus mean?

    • Thick-headed lizard
    • Spine lizard
    • Fused lizard
    • Different lizard

    Thick-headed lizard.

  2. What was on top of the head of Pachycephalosaurus?

    • A dome of solid bone
    • A tall sail
    • Three horns
    • A hollow crest

    A dome of solid bone. The top of its skull was a tall dome of solid bone.

  3. True or false: all scientists agree that Pachycephalosaurus head-butted.

    False. Pachycephalosaurus had a dome of solid bone on its head. Scientists have long argued about whether it head-butted.

  4. Which famous meat-eater lived at the same time and in the same place as Pachycephalosaurus?

    • T. rex
    • Allosaurus
    • Spinosaurus
    • Compsognathus

    T. rex.

  5. When did Pachycephalosaurus live?

    • In the Late Cretaceous
    • In the Triassic
    • In the Early Jurassic
    • Just a million years ago

    In the Late Cretaceous.

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