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A single pelvic bone is preserved
It was a theropod that lived in what is now the western United States
93 Exotic Trilobites of the World are illustrated actual or life size on this poster
They disappeared from North America as part of a mass extinction of most of the Pleistocene megafauna
Perchoerus, peccary skull Spinosaurus A single pelvic bone isPerchoerus is one of the rarest of the mammal fossils found in the White River Badlands and is much rarer than the cats and nimravids from the same area. They bear a strong resemblance to pigs, but pigs are from a separate family (the Suidae). They are the result of convergent evolution to pigs. During the convergent evolution, they occupied similar ecological niches and both were omnivorous rooters. The fossil record places peccaries in the Upper to
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