Stegosaurus

Period: The late jurassic - 150 milion years ago
Where: Western America and Europa (Portugal)
Fossil dimension: 9 meters long, 3,5 meters high
Quick facts: whether battling its own kind or predators, Stegosaurus could swing its two pairs of tail spiker (each up to 4 feet long) as awesome defensive weapons. The 17 bony dorsal plates arranged alterbately along its spine may have served as armor, a mating display, heat regulator or all three. These plates may have allowe stegosaurusto appear larger, thereby discouraging enemy attack.