Meet Hesperosaurus — the Western Lizard. The oldest stegosaur in North America, with plates that could flush with color and a tail that could shatter bone.
156 million years ago, in the Morrison Formation of Wyoming and Montana, this 6.5m plant-eater used its back as a message board. Was it for display? For temperature? For warning predators?
Watch till the end — the tail is the real weapon.
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