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Decorator crabs are crabs of several different species, belonging to the superfamily Majoidea (not all of which are decorators), that use materials from their environment to hide from, or warn off, predators. They stick mostly sedentary animals and plants to their bodies as camouflage or, if the attached organisms are noxious, to warn off predators through aposematism
Found among coral rubble. This one is a small specimen, around 1.5cm and its carrying a Sponge Coral as protection. Decorator crabs like Hermit Crabs, discard their 'protective shell' as they grow bigger as they then needs bigger thing to cover themselves.