The enormous mass of bone on the stegosaurus's back is quite impressive. But this herbivore is usually friendly. Just don't disturb or annoy it, because then it can become quite vicious. It'll lash out with its imposing, spiky tail. So it's best to keep this nine-meter-long prehistoric giant on your side! You can recognize the stegosaurus from a distance, and not just by its size. That fiery red, curved, double mass of bone on its back is unmistakable. The contrast with its yellowish lizard skin is a beautiful sight. With its head down, it lumbers across the meadows. Its tail is trying to keep up. It's probably grazing again. That's what the stegosaurus does all day long: this 4.5-ton herbivore doesn't just eat its fill. Who wants to help it?