Stegosaurus

Stegosaurus unugulatus was a stegosaurid dinosaur from the late jurassic USA,155 to 150 mya. Stegosaurus was the largest and one of the last stegosaurs it grew 9 metres long and weighed about 5.3 to 7 tons. Stegosaurus is known best for it's large plates and thagomizer spikes at the end of it's tail this was used to deter predators like allosaurus. Stegosaurus wasn't very smart due to it's walnut sized brain. Stegosaurus was one of the strangest dinosaurs.

Trivia

 * Stegosaurus was once thought to have two brains.
 * Stegosaurus was discovered in 1887 by Marsh.
 * Stegosaurus had "tooth crowns".