These dinosaurs had built-in crash helmets! Their strong skulls kept their heads protected when head-butting each other during fights or when defending themselves from predators. Palaeontologists think Pachycephalosaurus could repair bone very quickly if they needed to – which comes in handy if you head-butt things all day.

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Fact File


Meaning of name
Thick-headed lizard

5 m

500 kg


When it lived   
Late Cretaceous (65 million years ago)

Where it lived   
North America


The dome on the head of Pachycephalosaurus was up to 25 cm thick – about the same thickness as the mattress on your bed!

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