Aquatic Critters

SnailSnails belong to the group of animals called mollusks, which also includes clams and mussels. Mollusks have soft bodies, often enclosed within a hard shell. Snails have a "foot" on the underside that helps them to move around. They occur in most any freshwater ecosystem and are particularly common in areas with hard water, which may be rich in calcium. The snails use the calcium to build their shells. 
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