World 's most complete stegosaurus skeleton unveiled at Natural History Museum . Wyoming is 5.6m long and made up of more than 300 bones , 19 plates and four spikes . Found at Red Canyon Ranch in Wyoming , Skeleton , in 2013 , donated to museum in 2013 . And although its spine plates and spiked tail mean it looks a little threatening , back when it was alive Natural History Museum roamed the Earth 156 to 144 million years ago , in late Jurassic period .
World 's most complete stegosaurus skeleton unveiled at Natural History Museum . Wyoming is 5.6m long and made up of more than 300 bones , 19 plates and four spikes . Found at Red Canyon Ranch in Wyoming , Skeleton , in 2013 , donated to museum in 2013 . Natural History Museum roamed the Earth 156 to 144 million years ago , in late Jurassic period .