Snails are a common name given to members of the Gastropoda molluscs class. In a narrow sense, the term is given to those who have a curved shell in the adult stage. In a broad sense, which also becomes the meaning of "Gastropoda", including snails and naked snails (slugs without shells, Gastropoda class ranks second most in terms of the number of species of its members after Insecta.) Habitat, shape, behavior, and anatomy of snails vary greatly among members.
Snails can be found in different environments: from moat to desert, even to deep ocean. Most species of snails are marine animals. Many also live on land, fresh water, even brackish water. Most snails are herbivores, although some species that live on land and sea can be omnivores or predatory carnivores. Some examples of Gastropods are snails (Achatina fulica), garden slugs (Helix sp.), Sea slugs (Littorina sp.) And freshwater snails (Limnaea sp.)