Doug Perrine / Bioluminescence from glowing plankton in sea tide line on beach, with stars above and ship lights on horizon, Vaadhoo Island, Raa Atoll, Maldives, Indian Ocean, October 2010

Adam White / Aerial view of island, showing land, sea and reef, Seychelles

Martin van Lokven / Hawksbill Sea Turtle (Eretmochelys imbricata), D'Arros Island, Seychelles

Ingo Arndt / Blue Crab (Discoplax hirtipes) with claws raised in defensive / aggressive posture, endemic to Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / Blue Crab (Discoplax hirtipes) with claws raised in defensive / aggressive posture, endemic to Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / Christmas Island Frigatebird (Fregata andrewsi) in flight, This bird is critically endangered, and endemic to Christmas Island. Christmas Island, Indian Ocean, Australian Territory. November.

Ingo Arndt / Christmas Island Red Crab (Gecarcoidea natalis) blurred view of vast number of individuals moving along their annual migration route, Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / Brown Booby (Sula leucogaster plotus) head portrait, with wide bill open, Christmas Island, Indian Ocean, Australian Territory, November

Ingo Arndt / Golden Bosun / Tropicbird (Phaethon lepturus fulvus) in flight, endemic to Christmas Island, Indian Ocean, Australian Territory, November

Ingo Arndt / Robber / Coconut Crab (Birgus latro) close up of head and legs, Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / Christmas Island Red Crabs (Gecarcoidea natalis) crossing closed road, during annual migration, Christmas Island, Indian Ocean, Australian Territory, November 2009.

Ingo Arndt / Christmas Island Red Crabs (Gecarcoidea natalis) crossing road in huge numbers during annual migration, Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / Great frigatebird (Fregata minor listeri) drinking freshwater on the wing, Christmas Island, Indian Ocean, Australian Territory, November

Ingo Arndt / Christmas Island Red Crabs (Gecarcoidea natalis) arriving in huge numbers, at coast for spawning, Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / Christmas Island Red Crabs (Gecarcoidea natalis) gatthered together on beach the day before spawning, Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / Christmas Island Red Crabs (Gecarcoidea natalis) massing on coastal rocks, the morning after spawning, Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / Christmas Island Red Crabs (Gecarcoidea natalis) shortly before sunrise sitting on rock ready for spawning, Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / View from Margaret Knoll lookout of sunset and rain clouds over the Indian Ocean and the east coast of Christmas Island, Indian Ocean, Australian Territory, December 2009.

Ingo Arndt / Grass-Yellow butterflies (Eurema sp.) on tropical rainforest floor, Christmas Island, Indian Ocean, Australian Territory

Ingo Arndt / Red-footed Booby (Sula sula rubripes) in flight, returning to breeding colony after sunset, Christmas Island, Indian Ocean, Australian Territory, November.

Tony Wu / Juvenile Australian sea lion (Neophoca cinerea) silhouetted against blue skies at Carnac Island, Western Australia

Tony Wu / Juvenile Australian sea lion (Neophoca cinerea) resting in shallows, possibly to thermoregulate, Carnac Island, Western Australia.

Massimiliano Magnante/ BIA / White Tern (Gygis alba) pair, Bird Island, Seychelles

Pascal Kobeh / 'Lotus', an artificial reef built in 2001 with a steel frame with a mild electrical current which encourages the growth of coral, Ihuru Island, North Male Atoll, Maldives, Indian Ocean. Small reprodu...

Pascal Kobeh / Giant clam (Tridacna) on 'Lotus' artificial reef, built in 2001 with a steel frame using mild electric currents to encourage coral growth, with diver in the background. Vabbinfaru Island in North Male...

Pascal Kobeh / Sicklefin lemon shark (Negaprion acutidens) in the lagoon of Picard Island, Aldabra, Seychelles, Indian Ocean.

Jordi Chias / Green turtle (Chelonia mydas) from underneath swimming through the surface, Mayotte Island, Comores, Indian Ocean.

Jordi Chias / Hawksbill turtle (Eretmochelys imbricata) swimming over de reef, Mayotte Island, Comores, Indian Ocean.

Jordi Chias / Green turtle (Chelonia mydas) covering with sand the eggs after laying them in the beach, Europa Island, Eparse Islands / Scattered Islands in the Indian Ocean, Mozambique Channel, Indian Ocean.

Jordi Chias / Green turtle (Chelonia mydas) returning at sea after egg laying in the beach, Europa Island, Eparse Islands / Scattered Islands in the Indian Ocean, Mozambique Channel, Indian Ocean.

Jordi Chias / Male Green turtles (Chelonia mydas) inside lagoon, Europa Island, Eparse Islands / Scattered Islands in the Indian Ocean, Mozambique Channel, Indian Ocean.

Pascal Kobeh / Female Humpback whale (Megaptera novaeangliae) with its calf in open water, Reunion Island. Indian Ocean.

Hougaard Malan / Tropical beach, La Digue Island, Seychelles. October 2012.

Hougaard Malan / Rock formation on Anse Source d'Argent beach. La Digue Island, Seychelles. November, 2012.

Hougaard Malan / Rock formations in clear water on Anse Source d'Argent beach. La Digue Island, Seychelles. October, 2012.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Cape fur seal (Arctocephalus pussilus) portrait, at water surface, Seal Island, False Bay, Cape Town, South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) near surface, Seal Island, False Bay, South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) feeding on Brydes whale carcass (Balaenoptera brydei), Seal Island, False Bay South Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) feeding on Brydes whale carcass (Balaenoptera brydei), Seal Island, False Bay South Africa.

Chris & Monique Fallows / Split level shot of Great white shark (Carcharodon carcharias) fin above the water and leisure boat in the background, with Seal Island, False Bay, South Africa.

Jabruson / Fisherman with a haul of Halfbeaks (Hemirhamphus far) to be taken to Shimoni market from Wasini Island, off the coast of Kenya, February 2011. No release available.

Charlie Summers / Christmas Island Frigatebird (Fregata andrewsi) hovering in flight. Christmas Island, Indian Ocean, Australia, December.

Ingo Arndt / Blue Crab (Discoplax hirtipes) in defensive posture, Christmas Island, Indian Ocean, Territory of Australia

Juergen Freund / Christmas Island red crab (Gecarcoidea natalis) wearing Father Christmas hat, Christmas Island, Indian Ocean

Juergen Freund / Christmas Island red crabs (Gecarcidea natalis)Indian Ocean

Juergen Freund / Christmas Island red crabs mating {Gecarcoidea natalis} Indian Ocean, Australia

Gavin Hellier / Anse Severe Beach and Palm Tree at sunset, La Digue Island, Seychelles, Indian Ocean

Konrad Wothe / Bottlenose Dolphin (Tursiops truncatus) pair swimming over coral reef, Honduras

Norbert Wu / Bottlenose Dolphin (Tursiops truncatus) chases a school of Bigeye Scad (Selar crumenophthalmus), Roatan, Honduras

Norbert Wu / Granite Island and Coconut Palms, unique idyllic islands, Seychelles, Indian Ocean

Tui De Roy / Bottlenose Dolphin (Tursiops truncatus) leaping playfully through calm inter-island seas, Hood Island, Galapagos Islands, Ecuador

Norbert Wu / One-fin Flashlight Fish (Photoblepharon palpebratum) light organ under eye used in mating and attracting prey, Grand Comore Island, Indian Ocean

Juergen Freund / Island aerial view, the Maldives

Francis Abbott / Helengeli Island. North Male Atoll. Maldives

Pete Oxford / Killer whale in surf {Orcinus orca} Ile de la Possession Crozet Island

David Noton / Uninhabitated tropical island. South Male Atoll, Maldives.

Jeff Rotman / Newly hatched Hawksbill turtle baby swimming in sea (Eretmochelys imbricata) Sipadan Borneo

Juergen Freund / Coconut Crab on beach, Christmas Island, Indian Ocean.

Gavin Hellier / Anse Severe Beach and Palm Tree, La Digue Island, Seychelles, Indian Ocean

Gavin Hellier / Anse Source d'Argent Beach, La Digue Island, Seychelles, Indian Ocean

Juergen Freund / Whale shark {Rhincodon typus}, Christmas Island, Pacific Ocean

Juergen Freund / Whale shark {Rhincodon typus}, split level, Christmas Island, Pacific Ocean

Gavin Hellier / Granite Boulder at Anse Source d'Argent beach, La Digue Island, Seychelles, Indian Ocean

Gavin Hellier / Anse Source d'Argent Beach, La Digue Island, Seychelles, Indian Ocean

Gavin Hellier / Anse source d'Argent Beach, La Digue Island, Seychelles, Indian Ocean

Gavin Hellier / Anse Source d'Argent Beach, La Digue Island Seychelles, Indian Ocean

Gavin Hellier / Anse Source d'Argent Beach with granite boulders, La Digue Island Seychelles, Indian Ocean

Gavin Hellier / Anse Source d'Argent Beach with granite boulders, La Digue Island, Seychelles, Indian Ocean

Gavin Hellier / Sea Sand & Sky in stormy weather, Petite Anse beach, Mahe Island, Seychelles, Indian Ocean

Juergen Freund / Whale shark off Christmas Island, Indian Ocean

Rick Price / Coastal rock grave site of the Wunambal Gaambera / Uunguu people. Wary Bay, Bigge Island, Bonaparte Archipelago, The Kimberley, Western Australia.

Rick Price / Rocky coastline with view to location of cave with Aboriginal rock art. Wary Bay, Bigge Island, Bonaparte Archipelago, The Kimberley, Western Australia. 2015.

Rick Price / Brown booby (Sula leucogaster) on sea. Lacepede Islands Nature Reserve, The Kimberley, Western Australia.

Steven David Miller / Cape du Couedic Lighthouse, Flinders Chase National Park, Kangaroo Island, South Australia. February 2017.

Steven David Miller / Scott Cove Lookout near Cape Borda Lighthouse, Flinders Chase National Park, Kangaroo Island, South Australia. February 2017.

Enrique Lopez-Tapia / Sunset at Pura Tanah Lot / Tanah Lot Temple, Bali Island, Indonesia. 2015.

Graham Eaton / Shoal of Hardyhead Silverside (Atherinomorus lacunosus) hunted by a shoal of Bluefin Trevally (Caranx melampygus) along a shoreline. Komandoo Island, Maldives, January.

Graham Eaton / Giant trevally (Caranx ignobilis) Komandoo Island, Maldives, January

Graham Eaton / Bluefin Trevally (Caranx melampygus) in deep water, Komandoo Island, Maldives.

Graham Eaton / Black-blotched porcupinefish (Diodon liturosus) on reef, Komandoo Island, Maldives, January.

Shane Gross / Channel clinging crab (Mithrax spinosissimus) in a pond on Eleuthera Island, Bahamas.

Alex Mustard / Post larval Red Sea sailfin tang (Zebrasoma desjardinii), Gubal Island, Egypt. Strait Of Gubal, Gulf of Suez, Red Sea.

Ralph Pace / Bottlenose Dolphin (Tursiops truncatus) and diver, Revillagigedo Islands, Mexico

Martin van Lokven / Coconut Palm (Cocos nucifera) trees on beach, D'Arros Island, Seychelles