Atlantic Sea Scallops are bi-valve molluscs. These animals have two hinged shells formed of calcium carbonate. Bivalves such as scallops are threatened by ocean acidification, which affects the ability of this organism to build strong shells. Scallops have eyes! Scallops have hundreds of beautiful blue eyes around the edge of the shell, each of which can form an image using a combination of a lens, a focusing mirror, and retina. Scientists hypothesize that they use their eyes to sense potential predators, find good habitats and decide whether the concentration of suspended particles and water flow rates are sufficient for feeding.