sentences:  For example, "Pelia tumida" decorates itself only with sponges; "Macropodia rostrata" and "Libinia dubia" choose the noxious alga "Dictyota menstrualis" in some places, while "Inachus phalangium" chooses the same alga for the most exposed parts of its body; and "Stenocionops furcata" selects the stinging sea anemone "Calliactis tricolor" for its carapace.The choice of noxious or stinging organisms as decorations implies that attaching them provides protection from predators by aposematism rather than by crypsis, and there is direct observational evidence for this, e.g.that octopuses in tanks avoided decorated crabs.