Defines echinoderms, such as sand dollars and crown-of-thorns sea stars, describes their physical characteristics, life cycles, habitats, food, and means of self-defense.

Includes index.

What are echinoderms? -- Echinoderm bodies? -- The life cycles of echinoderms -- Where echinoderms live -- How echinoderms sense the world -- What echinoderms eat -- How echinoderms defend themselves -- Up close: sand dollars -- Up close : the crown-of-thorns sea star -- Where can you see echinoderms?.