Cuttlebone is a natural product derived from the internal shell of the cuttlefish, a marine animal related to squids and octopuses. This lightweight, porous structure is primarily composed of calcium carbonate, making it an excellent source of calcium for various pets, especially birds. Pet owners often provide cuttlebone to their feathered friends to help maintain healthy beaks and bones. In addition to its use in pet care, cuttlebone has other applications. It is sometimes used in the production of jewelry and as a polishing agent due to its fine texture. Cuttlebone is also popular in crafting and can be found in some aquarium supplies, benefiting aquatic life as well.