Defines crustaceans, such as slaters and freshwater crayfishes, and describes their physical characteristics, life cycles, habitats, senses, food and means of self-defense.

What are crustaceans? -- Crustacean bodies -- The life cycle of crustaceans -- Where crustaceans live -- How crustaceans sense the world -- What crustaceans eat -- How crustaceans defend themselves -- Up close: slaters -- Up close: freshwater crayfishes -- Where can you see crustaceans?.