
Stegosaurus armatus, meaning "roofed lizard" got its name from the flat plates jutting up from its back that regulated body temperature. At the end of the tail were four long spikes, probably used for defense and leverage. Up to 30 feet long, with short forelimbs and longer hind legs, the Stegosaurus had a tiny head and brain. It was a plant eater from the Ornithischia Order, living in the Jurrasic and Cretaceous eras around 200 million years ago. Fossil remains have been found in Colorado, Oklahoma, Utah and Wyoming.