The sheer mass of bone on the stegosaurus' back is quite impressive. But this herbivore is usually friendly. Just don't disturb or annoy him, because then he can be quite mean. He then lashes out with his impressive spiky tail. So you better keep a friend of this nine-meter-long prehistoric giant! You can recognize the stegosaurus from a distance, and not just because of its size. That crimson, curved, double bone mass on his back is unmistakable. The contrast with his yellowish lizard skin is a beautiful sight. He trudges across the meadows with his head down. He tries to keep his tail up. He'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 him with that?