- Means: Roof Lizard
- Period: Late Jurassic – 150 million years ago
- Where: Western North America and Europe(Portugal)
Whether battling its own kind or predators, Stegosaurus could swing its two pairs of tail spikes (each up to 4 feet long) as awesome defensive weapons. The 17 bony dorsal plates arranged alternately along its spine may have served as armor, a mating display, heat regulation, or all three. These plates may have allowed Stegosaurus to appear larger, thereby discouraging enemy attack.
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