Stegosaurus was the largest of the stegosaur group. Its fossils were found mainly in present-day Colorado, Utah, and Wyoming.
Like most of its group, Stegosaurus lived toward the end of the Jurassic period, about 150 mya.
Stegosaurus was about 25-30 feet long from nose to tail and probably weighed meer than 2 tons.
Its most striking feature was the row of large, roughly triangular bony plates along its back.
The name Stegosaurus means "roof reptile". This is because it was first thought that its bony plates lay flat on its back, overlapping like the tiles on a roof.
It is now thought that the back...
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