"Find out all about shells and how they help snails to stay safe and survive. Discover how shells are different on different animals and the different jobs they do."-- Provided by publisher.

Which animals have shells? -- What is a shell? -- What are shells for? -- How else do shells help animals? -- How do shells protect snails in winter? -- Are snails born with shells? -- How do other shells change? -- How do animals carry their shells? -- How do animals look after their shells? -- Shells quiz.