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4 until about 1
about the time that dinosaurs began to appear
Their tails were relatively stiff and probably used for balance
5 million years ago: Homo habilis
Megalodon meaning "big tooth" is an extinct species of shark that lived approximately 23 to 2
Thrinaxodon, cynodont (therapsid) Pteranodon 4 until about 1Thrinaxodon (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