With its small head and long snout, this herbivorous stegosaurus measured an impressive size: from 20 to 30 long and up to 14 feet high with a weight which could reach up to 3 tons. This curious quadruped lived in the late Jurassic period (approximately 150 million years ago) and is fascinating for the large plates which stood upright on its back. They could reach up to 7 feet in height and are thught to have helped with heat regulation. To defend itself, the stegosaurus’ long tail was equipped with spikes at the far end measuring up to 4 feet in length. An amazing weapon for this rather slow creature!