Scallops...
Scallops, such as the Atlantic bay scallop, do not burrow in the sand; instead, they lie on the bottom and move by using their adductor muscle to rapidly open and close their valves, ejecting water around the hinge. The adductor muscle is most often eaten, but most of the remainder is also edible.

Around the edge of the scallop's mantle is a series of blue eyes that, though rather weak, can detect movement nearby and warn of the presence of predators, particularly of sea stars.