Their foot is very muscular and walking is accomplished by the contraction and expansion of its muscle tissue. The mouth is easy to see. It opens and shuts as the snail eats microscopic plants. Inside of the mouth is a tongue that has a row of hard teeth. The snail rubs its tongue across the plants to make a kind of vegetable sawdust.
Snails have two pairs of tentacles.
The bottom tentacles are used for smelling and tasting. The longer ones are eyes. They do not work very well. The eyes can be drawn back. Snails can seal themselves in their shells with slime and stay there for several months or even years.