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This trigger is one of the more understated members of the family - adults are usually dark brown overall, while the throat and abdomen are often purplish-blue. The tail is light brown with white margins. When displaying or threatened this fish quickly spreads it caudal fin open, exposing the brilliant white coloration. This sudden "flash" of color may serve to distract or confuse an approaching predator. It feeds on a variety of invertebrates and the occasional small fish.