David Fleetham / Close-up of the pectoral fin of a Black Durgon / Pinktail Triggerfish (Melichthys vidua). Hawaii.

Alex Mustard / Caribbean reef shark (Carcharhinus perezii) with a pair of bar jacks (Caranx ruber) cruises through a school of black durgon (Melichthys niger) above a coral reef, East End, Grand Cayman, Cayman Isla...

Pete Oxford / Black durgon / triggerfish (Melichthys niger) from above, off Wolf Island, Galapagos Islands, Ecuador, South America

Norbert Wu / Lemon Butterflyfish (Chaetodon citrinellus) and Black Durgon (Melichthys niger) schooling, Hawaii

David Fleetham / Black triggerfish / Durgon (Melichthys niger), Hawaii.

David Fleetham / Black durgon (Melichthys niger) head portrait, Hawaii.

Doug Perrine / Bluespotted cornetfish (Fistularia commersonii) swimming over coral reef with Yellow tangs (Zebrasoma flavescens) and Black Triggerfish (Melichthys niger) swimming behind, Honokohau, Kona Coast, Big I...

Doug Perrine / Hawaiian spinner dolphin (Stenella longirostris longirostris) pod, with male performing genital buzz courtship behaviour on female. A shoal of Black durgon triggerfish (Melichthys niger) swimming behi...

David Fleetham / Black triggerfish (Melichthys niger) resting on reef, displaying defensive colouration, Hawaii, Pacific Ocean.

David Hall / Black durgon (Melichthys niger) school swimming over reef, Big Island, Hawaii, Pacific Ocean.

David Hall / Waves breaking on volcanic rocks with schooling Green jacks (Caranx caballus) and Barred flagtails (Kuhlia mugil) with Black durgons (Melichthys niger) and Redtail triggerfish (Xanthichthys mento), Re...

David Hall / Waves breaking on volcanic rocks with schooling Green jacks (Caranx caballus) and a single Black durgon (Melichthys niger), Revillagigedo Islands, Mexico, Pacific Ocean.