Stegosaurus was a large herbivore dinosaur from the late Jurassic period in North America. It lived in small groups with large herds of Camptosaurus. Camptosaurus are the eyes while Stegosaurus was the muscle. When a predator attacks them they start swinging there tail which is over in large sharp spikes. There plates on there back works two different ways, first way is that it cools down the dinosaurs the second is that when in heat, the colour of the plates change, showing they are ready to mate. The stegosaurus is said to be not the smartest dinosaur but in fact they are very intelligent, the only thing is they focus on one thing at a time so it takes some time to change its focus.