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Aspect: Oval narrow body with spectacular, but highly variable, colour schemes. Both dorsal and anal fins are set far back and feature long tip extensions. Population: Common. Notable feature: Blue or purple lines extend downwards from mouth crack and from nasal opening area, thin black lines radiate from eye. Why Triggerfish? The name is owed to its peculiar mechanical defense system by which the dart it erects in lieu of forward dorsal fin is vertically locked in place by the second spine. Environment: Near coral mounds, over sandy seabed from where it feeds on small crustaceans . Behaviour: Difficult to approach and photograph.