This giant rock scallop (Crassadoma gigantea) was nestled in a wall on a dive with only a small amount of its orange mantle showing. The giant rock scallop blends extremely well into its environment as surrounding life attaches and hides the shell valves. This scallop is large growing to about 10 inches (25 cm) across, and can live longer than 20 years. Giant rock scallops have been harvested for food in the past by the First Nations people of the Pacific Northwest. If an empty shell is found a purple stain can be seen where the hinge was located. The giant rock scallop has a range from northern Alaska to northern Mexico.