Echinoderms have radial symmetry. Starfish typically have five or more arms which radiate from a central point where their mouth is.

Echinoderms are invertebrates with hard plates under their skin. Some, like sea urchins, have movable spines on the outside of their bodies.

They live at the bottom of the sea. They crawl slowly on hundreds of tuber-like feet.

Invertebrates