Why are snails active when it rains?

Land snails are active when it rains. 

They must keep their bodies moist to survive. The human body consists of 60% water, but the bodies of snails consist of about 80% water. If the weather is hot and dry, their bodies will shrivel up and they will die. 

Their shells protect them from the weather. Summer is too hot and dry, and they could die in the heat so they stay inside their shells. Winter is too cold with too much rain on the ground so they hibernate or aestivate in their shells. Land snails cannot breathe under water, so they don’t like flooded areas. Whenever they are in their shells, they seal the opening of their shells with mucus that dries, making it act like a plug or a door.

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