Giant Hawkfish, Cirrhitus rivulatus, Arch, Darwin Island, Galapagos, Ecuador

Humphead wrasse (Cheilinus undulatus) over coral reef, the Great Barrier Reef, Pacific, Australia, Oceania

Humphead wrasse (Cheilinus undulatus), Small Brother dive site, Brother Islands, Egypt, Red Sea, Africa

Symbiotic behaviour Symbiosis of giant moray (Gymnothorax javanicus) with open mouth looks directly at observer lets cleaner wrasse bluestreak cleaner wrasse (Labroides dimidiatus) rid itself of parasites, Indian Ocean, Mascarene Islands, Mauritius, Africa

Humphead wrasse (Cheilinus undulatus), Daedalus reef dive site, Egypt, Red Sea, Africa

Close-up of giant moray (Gymnothorax javanicus) with cleaner fish, Abu Fendera reef dive site, Egypt, Red Sea, Africa