Georgette Douwma / Blacktongue unicornfish (Naso hexacanthus) composite image showing variation in marking on black background, Maldives, Indian Ocean.
David Fleetham / Sleek unicornfish (Naso hexacanthus) at a cleaning station with a Hawaiian cleaner wrasse (Labroides phthirophagus), Molokini Islet, Maui, Hawaii, Pacific Ocean.
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David Fleetham / Three Sleek unicornfish (Naso hexacanthus) at a cleaning station with a endemic Saddle wrasse, (Thalassoma duperrey) Hawaii.
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David Fleetham / Sleek unicornfish (Naso hexacanthus) which has turned a darker than normal colour to help an endemic Hawaiian cleaner wrasse, (Labroides phthirophagus) spot parasites, Hawaii.