STEGOSAURUS
(STEG-oh-sawr-us)

Stegosaurus lived about 140 million years ago. Its name means "Roofed Reptile" because of the two rows of 2 foot high, 1 inch thick plates along its back. On its tail the Stegosaurus had four large spikes. Its spikes were up to 3 feet high, and Stegosaurus would swing its spiky tail at enemies for protection. Being a plant-eater it had small, blunt teeth in the back of its jaws.

Stegosaurus measured up to 30 feet long. So it was the same length as a Triceratops. Even with the tremendous size of Stegosaurus, it only weighed about 2 tons which is about the same weight as a hippopotamus.

Would you believe that a dinosaur this large had a brain that was only the size of a walnut?

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