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Binacle's body resembles a hand. The "arm" is orange with a single white stripe and can stretch and contract at will. The "hand" is brown with three long claws and a face on the "palm" with two round eyes with black pupils, orange puffy cheeks, and no visible mouth. Binacle always live in pairs on one gray rock, when they fight, one of them will move to a different rock. It eats seaweed that washes up on the shoreline.