Thrinaxodon (pronounced thrin-AX-ah-DON) was a cat-sized cynodont, an ancestor of the mammals, but not a mammal itself. Thrinaxodon was not a dinosaur. This therapsid lived during the late Triassic period, roughly 240 million years ago. Small holes in the snout bones suggest that it may have had whiskers, a mammalian characteristic. Its teeth were also similar to those of mammals. The skull was about 1.5 inches long. Fossils have been found in South Africa and Antartica.
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