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Tube feet do more than just help a sea star move. Those hydro powered suckers also help the sea star smell, taste and touch their environment. Each tube foot is injected with water from the arms to control their movement hydraulically. Each arm has an eyespot at the tip that allows them to detect light. Captive adult sunflower sea star that is one of the breeding adults in the first-ever captive-breeding program for sea stars in the world. Housed at Friday Harbor Laboratories, Friday Harbor, Wash.