MICHAEL LONG / SCIENCE PHOTO LIBRARY MICHAEL LONG / SCIENCE PHOTO LIBRARY
Moschops head-butting, illustration. The skull of this extinct prehistoric animal evolved to withstand head-butting contests, similar to those seen in goats. This therapsid lived around 260 million years ago (in the later stages of the Permian) in what is today the Karoo region of South Africa. It was a herbivore, and grew to a length of some 5 metres. Therapsids, which evolved from reptiles, included the animals that later evolved into mammals.
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