The snail has a soft body covered by a harder, coiled shell. The snail creeps along on its foot, which is one big muscle. There are more than 80,000 kinds of snails. Some snails are smaller than a pinhead, and others are larger than two feet. Snails live almost everywhere, including forests, deserts, rivers and oceans. Snails that live on land eat rotting plants. Snails that live in rivers and lakes feed on water plants and dead animals.