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Definitions by ankylosaurusfangirl

Pachycephalosaurus 

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An ornithischian dinosaur from the Late Cretaceous period (70-66 million years ago) known for it's domed skull. Additionally the largest member of the family Pachycephalosauridae.
"The dinosaur Pachycephalosaurus is thought to have used it's domed head in combat with other members of it's species."
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