Stegosaurus lived during the late Jurassic period about 156–140 million years ago.
Stegosaurs reached lengths of up to 30 feet, weighed 1-2 tons and measured up to 12 feet tall at the highest point on its back. There is some anatomical evidence to suggest that stegosaurs could rear back on their hind legs to browse taller trees. The four long spikes at the end of its tail would ward off predators and were the slow-moving stegosaur's most effect defense.
The first Stegosaurus fossil was found in Colorado, USA, in 1876 by M. P. Felch.
Stegosaurus was originally named by Othniel Charles Marsh in 1877, from remains recovered north of Morrison, Colorado. These first bones became the holotype of Stegosaurus armatus.
Fossils of Stegosaurus have been found in western United States, in Europe, in eastern, southern Africa, and in Asia, particularly in southern India and in China.
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