Little is known of the behaviour of Echinolittorina placida. Like other members of its genus it feeds by grazing microalgae from hard surfaces using the proteinaceous teeth of the file-like radula ribbon.

The animals are active when wetted by the high tide or by rain. When the substrate dries out they withdraws into the shell, close the operculum, and remain attached to the substrate by means of a film of mucus at the anterior end of the aperture, thus conserving water and insulating the tissues from the hot rock surface.

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