Stegosaurus is one of the most recognizable dinosaurs ever discovered, famous for the tall plates along its back and the spiked tail known as a thagomizer. It lived during the Late Jurassic period around 155–150 million years ago in what is now North America, where it slowly moved through ancient floodplains feeding on low-growing plants. Despite reaching about 9 meters (30 ft) in length, Stegosaurus had a surprisingly small brain, though recent studies suggest its nervous system was more comple