The abundant eyes of a giant rock scallop (Crassadoma gigantea) are backed with tiny mirrors that reflect light, unlike our eyes that use lenses to bend and focus light. The mirror in each eye has multiple layers to gather different wavelengths of light, and reflect that light onto a double-layered retina. The many eyes located along the scallop’s mantle allow this animal to see pictures peripherally and centrally at the same time.
The giant rock scallop is large, and grows to about 10 inches (25 cm) across. This is a slow growing species that can live longer than 20 years of age. The giant rock scallop has a range from northern Alaska to northern Mexico.