MICHAEL LONG / SCIENCE PHOTO LIBRARY MICHAEL LONG / SCIENCE PHOTO LIBRARY
Thrinaxodon, illustration. This extinct cynodont therapsid was a small meat-eating mammal-like animal of the Early Triassic. It existed around 250 million years ago. Thrinaxodon was the size of modern foxes, and may have been covered in hair. Cynodonts included the animals that later evolved into mammals.
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