MICHAEL LONG / SCIENCE PHOTO LIBRARY MICHAEL LONG / SCIENCE PHOTO LIBRARY
Cynognathus, illustration. This extinct cynodont therapsid lived during the Middle Triassic, 247 to 237 million years ago. Its head was around 30 centimetres long, with jaws that contained the sharp teeth of a predator. It was about the size of a modern badger. Therapsids, which evolved from reptiles, included the animals that later evolved into mammals.
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