DescriptionThis is a fleshed-out model of the thick-headed lizard Pachycephalosaurus. The largest of the bone-headed dinosaurs, Pachycephalosaurus is known from only one skull and a few immensely thick skull roofs up to 25cm thick. The teeth were tiny. Because remains other than those of skulls are unknown, the body proportions and size had to be estimated from the known skeletons of other pachycephalosaurs, especially Stegoceras.
History Pachycephalosaurus type species was originally Pachycephalosaurus grangeri, but this was synonymized with earlier-named Troodon wyomingensis and thus became Pachycephalosaurus wyomingensis.
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