Stegosaurus would have lived in family groups and herds, moving slowly through forests while eating the low-growing plants. It is only since the 1990s that it has become accepted that these spikes stuck out horizontal to the ground, which would have been a potent defensive weapon when swung at a hunter. For years, every model of Stegosaurus showed it with the spikes sticking up into the air. The spikes on its tail are also the subjects of some controversy. It is also possible that they could move up and down, perhaps to intimidate predators. A more recent theory, however, suggests that they could have been used as a display during courtship and that they may have been brightly colored. The most prevalent theory is that they were used for cooling or heating the animal. The plates were up to 2-feet tall and 2-feet wide (.6 meters). There has been a great deal of debate about their use and arrangement. Most fascinating to people are the plates along its back. Its brain was once thought to have been the size of a walnut, but CAT-scans proved that it was actually the size of a kitten.

This was not actually a brain, but a bundle of nerves that helped relay information from its real brain. In fact, most scientists originally believed that its brain was too small to control such a large creature and that it used an auxiliary 'brain' located above its rear legs to help control its movements. Stegosaurus is often called the dumbest dinosaur because of its incredibly small brain. The spikes on its tail would have made a powerful weapon against any hungry predators. This plant-eater evolved to find its food in the low-growing plants of the late Jurassic. The plates along its back, its small head and spiked tail make it a peculiar and unique dinosaur. It roamed the open plains of the Late Jurassic Period in what is now North America. It is the largest and most famous member of the stegosaur family. Stegosaurus is easily one of the best known dinosaurs and is recognized all over the world.

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