JOHN SIBBICK / SCIENCE PHOTO LIBRARY JOHN SIBBICK / SCIENCE PHOTO LIBRARY
Thrinaxodon cynodont and pups, illustration. Thrinaxodon 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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