Late Jurassic (145 million years ago)
Western North America, Africa, China, Mongolia, and Europe
26 - 30 ft long, 9 ft tall
This plate back dinosaur lived all across the world in Jurassic times. Stegosaurus was the largest of the them all. Its huge plates look dangerous but they were too thin to be useful weapons. Instead they were used to attract mates or perhaps to help warm the dinosaur in the sun.