Archivo: Pachycephalosaurus skull

Description: The holotype adult skull of Pachycephalosaurus "reinheimeri" (DMNS 469).
Title: Pachycephalosaurus skull
Credit: Horner JR, Goodwin MB (2009) Extreme Cranial Ontogeny in the Upper Cretaceous Dinosaur Pachycephalosaurus. PLoS ONE 4(10): e7626. doi:10.1371/journal.pone.0007626.g006
Author: John R. Horner, Mark B. Goodwin
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