Sand Dollars are echinoderms (which means "spiny skin") and are related to sea urchins and sea stars. Their tiny larvae (baby Sand Dollars) travel many miles as they are swept along by ocean currents.

Anatomy: Sand Dollars have 5-part radial symmetry. These invertebrates have a hard skin made of calcium carbonate plates. The bottom surface contains the mouth, many black spines (which trap food), and the cilia (small hairs) that help direct food into the mouth. Sand Dollars have tiny tube feet that are used as gills. The holes on the top surface are where the eggs and sperm are released.

Diet: Sand Dollars eat tiny particles of food that float in the water.

Predators: Sand Dollars are eaten by sea stars (also known as starfish), snails, and skates.