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Goose barnacles (order Pedunculata), also called stalked barnacles or gooseneck barnacles, are filter-feeding crustaceans that live attached to hard surfaces of rocks and flotsam in the ocean intertidal zone. Some species of goose barnacles are pelagic and are most frequently found on tidewrack on oceanic coasts. Unlike most other types of barnacles, intertidal goose barnacles depend on water motion rather than the movement of their cirri for feeding, and are therefore found only on exposed or moderately exposed coasts. In Portugal and Spain, they are a widely consumed and expensive delicacy known as percebes. Percebes are harvested commercially in the northern coast, mainly in Galicia, and are also imported from overseas, particularly from Morocco and Canada.