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Clue #1 This clings to rocks.
Clue #2 It eats algae.
Clue #3 It has a hard shell.
This is a chiton. Chitons are mollusks. Their hard, leathery shell is made of eight separate plates. They are very sluggish and can be found clinging to rocks in the intertidal zone. They use radula (or a ribbon of hard teeth) to eat. They eat algae, seaweed debris, dead animals, small worms, and crustaceans. Their predators are crabs, fish, and anemones.