These provide information regarding smell and touch. The mouth is under the head. The tongue acts like a cheese grater, scraping off bits of food. Snails are primarily herbivores, although some will partake in a meal of a dead animal if the opportunity arises. Internal organs, such as the heart, remain inside the shell.
Most aquatic snails have gills, but land snails have a breathing chamber.
The land snail's breathing pore can be seen as a small hole on the right side of the body, just inside of the shell. Some freshwater snails also have this breathing chamber, and so must occasionally come to the surface for air. Another hole in this region is linked to the intestines, and is used to expel wastes. Land snails are hermaphroditic, that is, each snail has both male and female parts. They still must mate to reproduce, however.