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Underside Of a Sea Star


The sea star's mouth is located on its underside.
Northern Sea Star Underside / Blue Ocean Society

The underside of a Northern sea star. Look closely and you may see the sea star's tube feet. Its mouth is located in the center of the star.

© Blue Ocean Society

Sea stars feed on bivalves like clams and mussels, and other animals such as small fish, barnacles, oysters, snails and limpets. They feed by "grasping" their prey with their arms, and extruding their stomach through their mouth and outside their body, where they digest the prey. They then slide their stomach back into their body.

This image shows the underside of a sea star, and you can see it mouth (in the middle) and its tube feet.

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