Seashells are the exoskeletons of mollusks such as clams, oysters, and snails. They are generally composed of calcium carbonate. This distinguishes them from typical animal structures as they are not ...

made up of cells. 9 out of 10 shells opens to the right, making sinistral or left-opening shells a rarity, sought after by collectors. This infographic presents 21 unique and beautiful seashells from around the world.