Biology/Natural History: Moves at night at high tides. This species homes to a special place on the rock after each trip. Home ranges of different individuals usually do not overlap. Permanently submerged individuals in tidepools may not home. Feeds primarily on the red alga Mastocarpus papillata and Endocladia muricata, green alga Cladophora. Larvae will settle on rocks or shells covered with an algal film.