Pachycephalosaurus

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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Gardiner Haskins

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Pachy1

Fact File

Pronounced   
PACK-ee-seff-a-low-SORE-us

Meaning of name
Thick-headed lizard

Length    
5 m

Weight    
500 kg

Diet    
Herbivorous

When it lived   
Late Cretaceous (65 million years ago)

Where it lived   
North America

DINOMAZING FACT!

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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