Defines mollusks, such as land snails and pearl oysters, and describes their physical features, life cycles, habitats, sense, food, and means of self-defense.

What are mollusks? -- Mollusk bodies -- The life cycles of mollusks -- Where mollusks live -- How mollusks sense the world -- What mollusks eat -- How mollusks defend themselves -- Up close: land snails -- Up close: pearl oysters -- Where can you see mollusks?.