Richard Robinson / Scimitar triggerfish (Sufflamen bursa) at Vatoa Island / Turtle Island by Captain Cook, Lau Island Group, Fiji.

Richard Robinson / Arc-eye wawkfish (Paracirrhites arcatus) at Ono-i-Lau / Ono-i-Tonga, Lau Island Group, Fiji.

Linda Pitkin / Slender grouper (Anyperodon leucogrammicus) sheltering by gorgonian sea fan and other corals on coral reef Cape Kri, Dampier Strait, Raja Ampat, West Papua, Indonesia, March 2016

Alex Mustard / Slender grouper (Anyperodon leucogrammicus) exploiting the confusion caused by and Orange spotted trevally (Carangoides bajad) hunting silversides (Atherinidae) to plan an ambush. Raja Ampat, West Pap...

Tony Wu / Bluestreak cleaner wrasse (Labroides dimidiatus) cleaning and attending Slender grouper (Anyperodon leucogrammicus). Pacific ocean, Papua New Guinea.

David Fleetham / Yellow elephant ear sponge (Ianthella basta) with dark-coloured Whiteline sea cucumbers (Synaptula lamperti) and the paler, unnamed species, Philippines.