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Guard Crabs are small Crabs (around 1 - 1.5 cm) that are usually found living among the crevices of branching/stony corals of Pocillopora, Seriatopora and Stylophora. In the picture, this Guard Crab/Red Coral Crab can be seen sharing home with a Red Head Goby - Paragobiodon echinocephalus. They are called Guard Crabs because they guards/defends their coral host against Star Fishes. They feeds on tissues and mucus of their coral host.