Stegosaurus is of the various plated dinosaurs of the Late Jurassic Period around 159 million to 144 million years ago. They were recognized by its spiked tail and series of large triangular bony plates along with the back.
Stegosaurus usually grew to a length of 6.5 meters (21 feet), and some reached 9 meters (30 feet). The skull and brain were tiny.
The feet were short and broad, and the forelimbs were much more concise than the hind limbs. They had two parallel rows of plates, staggered or paired. It provides protection to the animal’s backbone and spinal cord. You can find various Stegosaurus Fossils which are available in the market.
The plates contained many blood vessels; the alternating placement appears consistent with a hypothesis of thermoregulation. These plates act as a radiator which releases heat of the body to a cooler ambient environment.
On the end of the tail, two pairs of pointed bony spikes were present, which acted as defensive weapons. The spinal cord was enlarged and was actually larger than the brain.
Stegosaurus and its relatives are closely related to Ankylosaurs. They share many features of them, including dermal armour, a simple curved row of small teeth, etc.
These both groups are evolved from small armoured dinosaurs such as Scutellosaurus and Scelidosaurus of the Early Jurassic Period. 
Many fossils of Stegosaurus have been found in Western North America, Western Europe, Southern India, South Africa and China. The first Stegosaurus fossil was found in Colorado, USA, in 1876 by M.P. Felch.
Only one set of Stegosaurus footprints have been found so far and were stolen from Western Australia in 1996.
CLASSIFICATION-Stegosaurus was a herbivorous ornithischian dinosaur. It belongs to the group Thyreophora and the group Stegosauridae.
Stegosaurus was the largest and one of the last of the stegosaurids. The type species is S.armatus.
PREDATORS OF STEGOSAURUS-The possible predators of Stegosaurus include all the large meat-eaters from Western North America during the Late Jurassic Period. Some of these meat-eaters include Ceratosaurus, Allosaurus, Torvosaurus, Marshosaurus and small meat-eaters like Ornitholestes.
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