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Humpback whales (Megaptera novaeangliae), Ningaloo Reef, UNESCO World Heritage Site, Exmouth, Western Australia, Australia, Pacific

An adult golden spadefish (Platax boersii), off Sauwaderek Village Reef, Raja Ampat, Indonesia, Southeast Asia, Asia

An adult soldierfish (Myripristis spp), off the reef on Kawe Island, Raja Ampat, Indonesia, Southeast Asia

Crinoid from the Family Mariametridae, in the shallow reefs off Bangka Island, Indonesia, Southeast Asia, Asia

Encrusting sponges, soft corals, and other invertabrates living on pilings on Arborek Reef, Raja Ampa, Indonesia, Southeast Asia, Asia

Close up of coral polyps, the house reef at Kawe Island, Raja Ampat, Indonesia, Southeast Asia, Asia

Southern Giant Petrels (Macronectes giganteus) attacking and eventually killing an imperial rock shag (Phalacrocorax atriceps) on a tiny offshore reef in the Beagle Channel outside Ushuaia, Argentina

Cup coral colony (Tubastrea micrantha) A diver looks down on a large cup coral colony. Komodo, Indonesia, Pacific Ocean.

Yellow Giant frogfish, Antennarius commerson, eye and mouth. This is the largest of all frogfish and is widespread on coral reefs in the Indo-Pacific region. Lembeh Strait, North Sulawesi, Indonesia, Pacific Ocean.

Golden sweepers, Parapriacanthus ransonneti. This species is often found in thick schools in dark reef recesses. Buyat Bay, North Sulawesi, Indonesia, Pacific Ocean.

White-eyed moray eel, Siderea thyrsoidea. Often pokes its head out of holes and crevices on coral reefs in the Indo-Pacific region. Lembeh Strait, North Sulawesi, Indonesia, Pacific Ocean.

Soft coral colony (Sinularia sp.) Coral colony growing on a diverse and healthy tropical reef. Komodo, Indonesia, Pacific Ocean.

Soft coral colony (Dendronephthya sp.) and Golden sweeper fish (Parapriacanthus ransonneti) Komodo, Indonesia, Pacific Ocean.

Yellow boxfish (Ostracion cubicus) Juvenile animal swimming about coral reef. Lembeh Strait, North Sulawesi, Indonesia. More info: This species incorporates tetrodotoxin within its tissues.

Giant frogfish (Antennarius commersoni) and diver. Cannibal Rock, Horseshoe Bay, Rinca Island, near Komodo, Indonesia.

Crocodilefish (Cymbacephalus beauforti) Adult fish camouflaged on a coral reef. Komodo, Indonesia, Pacific Ocean.

Soft corals (Dendronephthya sp.) growing on mangrove prop roots (Rhizophora sp.) Raja Ampat, Papua, Indonesia, Pacific Ocean.

Diver looks down on blue seastar (Linkia laevigata) on a barrel sponge (Xestospongia sp.) Komodo, Indonesia, Pacific Ocean.

Diver looks at diverse coral reef including a green cup coral colony (Tubastrea micrantha) Komodo, Indonesia, Pacific Ocean.

Soft coral (Dendronephthya sp.) growing on shallow coral reef. Raja Ampat, Papua, Indonesia, Pacific Ocean.

Crown-of-Thorns seastar (Acanthaster planci) Adult animal working its way across sand towards a coral reef. Yap, Federated States of Micronesia, Pacific Ocean. More info: This species feeds on coral as an adult and, in the right circumstances, be devestating to large reef areas.

Giant frogfish (Antennarius commersoni) Adult fish blends into a diverse coral reef. Cannibal Rock, Horseshoe Bay, Rinca Island, near Komodo, Indonesia.

Jourdan's turban (turbo jourdani) large gastropod shell, reddish-brown, Rottnest Island reef, wild, day, marine protected area, free-diving off, cool temperate waters of Western Australia. MORE INFO: Marine plant common kelp, a dominant feature of the underwater landscape. Protected areas are covered in lush growth of diverse algae, also red algea are here.

western king wrasse (coris auricularis), male, dark pink colour with reddish-brown band running around boby and blue-green colouration over the head, wild, day, marine protected area, diving off Rottnest Island, reef edges, sand, seagrass, Western Australia, Indian Ocean. MORE INFO: social structure where dominant male, usually the biggest in the area, will have a harem of females. When the male dies or is absent for any length of time the largest female will change sex and dominate the group.

tallfin batfish (platax teira), juvenile, wild, day, marine protected area, diving off Coral Bay, Ningaloo reef, Western Australia, Indian Ocean. MORE INFO: with 3 dark bars, very long dorsal, anal and pelvic fins, feed on plankton from water column.

bengal sergeant (abudefduf bengalensis) wild, day, marine protected area, diving off Coral Bay, Ningaloo reef, Western Australia, Indian Ocean. MORE INFO: has rounded, white-edged tail lobes.

footballer sweep (neatypus obliquus) diagonal yellow bands are edged in black and stand out against the silvery-blue body, wild, day, marine protected area, reef, in small schools diving off Rottnest Island, Western Australia, Indian Ocean. MORE INFO: other name stripey, eating green algae as they sweep over the reef.

Southern Giant Petrels (Macronectes giganteus) attacking and eventually killing an imperial rock shag (Phalacrocorax atriceps) on a tiny offshore reef in the Beagle Channel outside Ushuaia, Argentina

Southern Giant Petrels (Macronectes giganteus) attacking and eventually killing an imperial rock shag (Phalacrocorax (atriceps) atriceps) on a tiny offshore reef in the Beagle Channel outside Ushuaia, Argentina

Snorkeler with green sea turtle (Chelonia mydas) at cleaning station at Olowalu Reef on the west side of the island of Maui, Hawaii, USA

Leaf scorpionfish (Tainianotus triacanthus) Adult fish lying on a reef-building coral. Komodo, Indonesia, Pacific Ocean.

Close-up of head and eye of reef Cornetfish, Smooth flute mouth ( Fistularia commersonii ), Mahe, Seychelles, Indian Ocean (rr)

Snorkeler with green sea turtle (Chelonia mydas) at cleaning station at Olowalu Reef on the west side of the island of Maui, Hawaii, USA

Snorkeler with green sea turtle (Chelonia mydas) at cleaning station at Olowalu Reef on the west side of the island of Maui, Hawaii, USA

Acropora hard corals ( Porites antennuata) and school of Anthia fish, reef crest, Sipadan, Sabah, Malaysia, Borneo, South-east Asia

Snorkeler with green sea turtle (Chelonia mydas) at cleaning station at Olowalu Reef on the west side of the island of Maui, Hawaii, USA

Green sea turtle (Chelonia mydas) at cleaning station (note fishing hook embedded in mouth) at Olowalu Reef on the west side of the island of Maui, Hawaii, USA

Hard corals on reef crest and Many-spotted sweetlips ( Plectorhinchus chaetodontoides ), Sipadan, Sabah, Malaysia, Borneo, South-east Asia (rr)