Speaking of Great Minds! Pachycephalosaurs (Bone-
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Pachycephalosaurs (Bone-Headed Dinosaurs)
Dracorex
Twenty million years before the dinosaurs went extinct, a strange new breed evolved: small- to medium-sized, two-legged herbivores possessing unusually thick skulls. It's believed that pachycephalosaurs like Stegoceras and Colepiocephale (Greek for "knucklehead"
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