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Rock-Chewing Sea Urchins Have Self-Sharpening Teeth


California Purple Sea Urchin

(December 28, 2010) Sea Urchins are known for their armour of spines but their teeth can literally chew through stone without getting dull.

Sea Urchins chew into rock to carve out nooks where they can protect themselves from predators and rough seas. Researchers have studied the California purple sea urchin to learn how their teeth remain sharp.

For the full story visit nationalgeographic.com



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