Andy Rouse / Galapagos green turtle (Chelonia mydas agassisi) underwater portrait, being inquisitive, note algae growing on head and shell

Sergio Hanquet / Green sea turtle (Chelonia mydas), two viewed from above. Tenerife, Canary Islands.

Alex Mustard / Green turtle (Chelonia mydas) feeding on Seagrass (Halophila stipulacea), blowing sand out of nostrils, on sea floor. Marsa El Shouna, Marsa Alam, Egypt.

Alex Mustard / Green turtle (Chelonia mydas) resting on sea floor and two juvenile Golden trevally (Gnathanodon speciosus). Marsa El Shouna, Marsa Alam, Egypt.

Gary Bell/ Oceanwide / Green Sea Turtle (Chelonia mydas), Heron Island, Great Barrier Reef, Queensland, Australia

Gary Bell/ Oceanwide / Green Sea Turtle (Chelonia mydas), Heron Island, Great Barrier Reef, Queensland, Australia

Alex Mustard / Green turtle (Chelonia mydas) descending after breathing at the surface. Misool, Raja Ampat, West Papua, Indonesia. Ceram Sea. Tropical West Pacific Ocean.

Shane Gross / Green sea turtle (Chelonia mydas) resting in a coral reef. Eleuthera, Bahamas.

Tui De Roy / Green turtle (Chelonia mydas), female returning to the sea after egg laying, Puerto Pajas, Isabela Island, Galapagos

Ralph Pace / Green Sea Turtle (Chelonia mydas), San Diego, California

Nick Hawkins / Galapagos green turtle (Chelonia mydas agassizi) swimming above sea floor with shoal of fish in background. Off San Cristobal Island, Galapagos.

Tui De Roy / Green turtle (Chelonia mydas) female digging nest, North coast, Santa Cruz Island, Galapagos

Alex Mustard / Galapagos green turtle (Chelonia mydas agassizii) swims over a coral reef. Darwin Island, Galapagos National Park, Galapagos Islands. East Pacific Ocean.

David Fleetham / Green sea turtles (Chelonia mydas) on corals, Hawaii.

David Fleetham / Silhouette of a Green Sea Turtle (Chelonia mydas) passes overhead. West Maui, Hawaii.

David Fleetham / Green Sea Turtles (Chelonia mydas) gathering at a cleaning station off where small fish will remove their parasites. West Maui, Hawaii.

David Fleetham / Green Sea Turtle (Chelonia mydas) below surf instructor Tara Angioletti on a stand-up paddle board off Canoe Bearch, Maui, Hawaii. Model released.

David Fleetham / Green turtle (Chelonia mydas) swimming towards surface, Hawaii.

Claudio Contreras / Green Turtle (Chelonia mydas) trapped in fishing net, Sea of Cortez (Gulf of California), Mexico, May, Third Place in the third National Contest 'Visions of our nature' organised by Mexico'...

Nick Hawkins / Green sea turtle female (Chelonia mydas) returning to the sea, Tortuguero National Park, Costa Rica.

Alex Mustard / Green sea turtle (Chelonia mydas) female resting on a coral reef. Rock Islands, Palau, Mirconesia. Tropical west Pacific Ocean

Pedro Narra / Green turtle (Chelonia mydas) resting in the shallows of the coast, Bijagos Islands, Guinea Bissau. Endangered species.

Pedro Narra / Green Turtle (Chelonia mydas), digging nest. Bijagos Islands, Guinea Bissau. Endangered species.

Claudio Contreras / Green turtle (Chelonia mydas) Akumal, Caribbean Sea, Mexico, January. Endangered species.

Claudio Contreras / Green turtle (Chelonia mydas) over sea floor, Akumal, Caribbean Sea, Mexico, January. Endangered species.

Claudio Contreras / Green turtle (Chelonia mydas) wide angle view of fin, Akumal, Caribbean Sea, Mexico, January. Endangered species.

Claudio Contreras / Green turtle (Chelonia mydas) with rays of sunlight, Akumal, Caribbean Sea, Mexico, January. Endangered species.

Pedro Narra / Green turtle (Chelonia mydas) female digging nest on beach at night, Guinea Bissau. Endangered species. 3rd Place in the SOS Especes Menacees / SOS Endangered Species Portfolio category of the Terre S...

Pedro Narra / Green Turtle (Chelonia mydas) returning to sea, Bissagos Islands, Guinea Bissau. Endangered species. 3rd Place in the SOS Especes Menacees / SOS Endangered Species Portfolio category of the Terre Sau...

Pedro Narra / Man and woman undertaking monitoring work measuring Green turtle (Chelonia mydas) nests as the the female digs it, Bissagos Islands, Guinea Bissau. Endangered species. 3rd Place in the SOS Especes M...

Pedro Narra / Local people gathered for education program to conserve the wildlife of the Bissagos Islands including the endangered Green turtle (Chelonia mydas) Bissagos Islands, Guinea Bissau, October 2014. 3rd P...

Pedro Narra / Shell of Green Turtle (Chelonia mydas) outside mud house, Bissagos Islands, Guinea Bissau. Endangered species. 3rd Place in the SOS Especes Menacees / SOS Endangered Species Portfolio category of the...

Pedro Narra / Green turtle (Chelonia mydas) hatchlings emerging from nest, Bissagos Islands, Guinea Bissau. Endangered species. 3rd Place in the SOS Especes Menacees / SOS Endangered Species Portfolio category of...

Pedro Narra / Green turtle (Chelonia mydas) hatchling at sea surface, Bissagos Islands, Guinea Bissau. Endangered species. 3rd Place in the SOS Especes Menacees / SOS Endangered Species Portfolio category of the Te...

Pedro Narra / Green turtle (Chelonia mydas) hatchling caught in fishing net, Bissagos Islands, Guinea Bissau. Endangered species. 3rd Place in the SOS Especes Menacees / SOS Endangered Species Portfolio category of...

Pedro Narra / Green turtle (Chelonia mydas) returning to see after egg laying, e to open sea after digging nest. Bissagos Islands, Guinea Bissau. Endangered species. 3rd Place in the SOS Especes Menacees / SOS End...

Pedro Narra / Green turtle (Chelonia mydas) two interacting at surface, Bissagos Islands, Guinea Bissau Endangered species. 3rd Place in the SOS Especes Menacees / SOS Endangered Species Portfolio category of the...

Alex Mustard / Three Galapagos green turtles (Chelonia mydas agassizii) feeding on seaweed growing on lava rocks in sunny shallow water. Floreana Island, Galapagos Islands, Ecuador. East Pacific Ocean.

Pete Oxford / Green Sea Turtle (Chelonia mydas), Hol Chan Marine Reserve, Belize

Georgette Douwma / Green turtle (Chelonia mydas) with two large remoras (Echeneis naucrates) attached to its carapace, at rest on artificial reef. Mabul, Malaysia.

Juergen Freund / Green turtle (Chelonia mydas) hatchling swimming to the sea still in the shallows of the beach. Anano Island, Wakatobi, South Sulawesi, Indonesia

Pete Oxford / Pacific Green Sea Turtle (Chelonia mydas agassizi) and snorkeler, Galapagos Islands, Ecuador

Pete Oxford / Pacific Green Sea Turtle (Chelonia mydas agassizi), Galapagos Islands, Ecuador

Jordi Chias / Juvenile Green turtle (Chelonia mydas) Armenime cove, South Tenerife, Canary Island, Atlantic Ocean

Jordi Chias / Juvenile Green Turtle (Chelonia mydas) Armenime cove, South Tenerife, Canary Island, Atlantic Ocean

Jordi Chias / Juvenile Green Turtle (Chelonia mydas) Armenime cove, South Tenerife, Canary Island, Atlantic Ocean

Jordi Chias / Green Turtle (Chelonia mydas) from underneath with diver in the background, Sulawesi, Indonesia, Indian Ocean.

Jordi Chias / Juvenile Green turtle (Chelonia mydas) swimming near the surface, split level view, Fakarava atoll lagoon, Tuamotu Archipelago, French Polynesia, Pacific Ocean.

Jordi Chias / Juvenile Green turtle (Chelonia mydas) swimming near the surface, split level view, Fakarava atoll lagoon, Tuamotu Archipelago, French Polynesia, Pacific Ocean.

Jordi Chias / Juvenile green turtle (Chelonia mydas) reflected in the surface of the window with Snell's window affect, Fakarava atoll inside lagoon at sunset, Tuamotu archipelago, French Polynesia; Pacific Ocean

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

Jordi Chias / Green turtle (Chelonia mydas) feeding in Cymodocea, inside lagoon, Mayote Islands, Indian Ocean

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

Jordi Chias / Juvenile Hawksbill turtle (Eretmochelys imbricata) released by biologist after being tagged, Cayman; Cayman Islands Archipelago.

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.

Tim Fitzharris / Green Sea Turtle (Chelonia mydas) and Orange-striped Triggerfish (Balistapus undulatus), Apo Island, Philippines

Michael Pitts / Green turtle (Chelonia mydas) swimming over a reef, Maldives, Indian Ocean.

Tim Fitzharris / Green Sea Turtle (Chelonia mydas) swimming with a school of butterfly fish, Apo Island, Philippines

Michael Pitts / Green Turtle (Chelonia mydas) hatchling swimming out to deep water from Karan Island, Saudi Arabia, Arabian Gulf.

Michael Pitts / Green Turtle (Chelonia mydas) Hatchling swimming out to deep water from Karan Island after being released from boat. Saudi Arabia. Arabian Gulf.

Michael Pitts / Green sea turtles (Chelonia mydas) mating turtles. Karan Island, Arabian Gulf.

Michael Pitts / Cameraman Michael Pitts filming Green turtle (Chelonia mydas) Karan Island. Arabian Gulf, June 2009

Juergen Freund / CT scan of injured Green turtle 'Angie' (Chelonia mydas) from the Cairns Turtle Rehabilitation Centre, Cairns Diagnostic Imaging. Queensland, Australia

Juergen Freund / CT scan of injured Green turtle 'Angie' (Chelonia mydas) from the Cairns Turtle Rehabilitation Centre, Cairns Diagnostic Imaging. Queensland, Australia

Juergen Freund / Junior ranger carries a green turtle (Chelonia mydas) to shore for the scientific research data gathering. Queensland, Australia, May 2011. Model released.

Mark MacEwen / Green Sea Turtle (Chelonia mydas) returning to sea after Egg laying, Raine Island, Australia. Raine Island is the largest and most important green sea turtle nesting area in the world, with over 14,00...

Claudio Contreras / Green Turtle (Chelonia mydas) hatchling on its way to the sea, Ria Lagartos Biosphere Reserve, Yucatan Peninsula, Mexico, August. Endangered species.

Jordi Chias / Green Turtle, (Chelonia mydas), Swimming over volcanic sandy bottom, Armenime cove, South Tenerife coast, Canary Islands, Spain, Atlantic Ocean, May 2011, Commended in Wildlife Photographer of the Yea...

Cheryl-Samantha Owen / Green turtles (Chelonia mydas) pair mating near surface, Aldabra Atoll, Seychelles, Indian Ocean

Claudio Contreras / Green Seaturtle (Chelonia mydas) in profile above sandy shallow sea bed. Endangered, Cancun National Park, Caribbean Sea, Mexico.

Doug Perrine / Green sea turtle (Chelonia mydas) being cleaned of algae by Yellow tangs / surgeonfish (Zebrasoma flavescens), Puako, Kona, Hawaii, USA, June, Endangered species

Doug Perrine / Green sea turtle (Chelonia mydas) cleaned of algae by Yellow tangs / surgeonfish (Zebrasoma flavescens), Puako, Kona, Hawaii, USA, June, Endangered species

Juergen Freund / Green turtles (Chelonia mydas) mating over coral reef, Sipadan Island, Sabah, Malaysia, June, Endangered species

Juergen Freund / Rangers catching a Green turtle (Chelonia mydas) for tagging and release, Tetepare Island reserve, Solomon Islands, July 2010

Inaki Relanzon / Hawksbill turtle (Eretmochelys imbricata) in shallow water. Nosy Be, north Madagascar, Africa.

Juergen Freund / Baby green turtle (Chelonia mydas) hatchling in the shallows of the beach, swimming out to sea. Anano Island, Wakatobi, South Sulawesi, Indonesia, November

Juergen Freund / Baby green turtle (Chelonia mydas) hatchling in the shallows of the beach, swimming out to sea. Anano Island, Wakatobi, South Sulawesi, Indonesia, November.

Juergen Freund / Green turtle (Chelonia mydas) with schooling Bigeye jacks / trevally (Cranax sexfasciatus). Sipadan Island, Sabah, Malaysia, June

Juergen Freund / Green sea turtle (Chelonia mydas) resting in a crevice in the coral reef. Sipadan Island, Semporna, Sabah, Malaysia, June

Juergen Freund / Green turtle (Chelonia mydas) swimming near the surface in the reef shallows. Sipadan Island, Sabah, Malaysia, June

Juergen Freund / Mating pair of Green turtles (Chelonia mydas) in the reef shallows. Sipadan Island, Sabah, Malaysia. June

Juergen Freund / Mating Green turtles (Chelonia mydas) in the reef shallows. Sipadan Island, Sabah, Malaysia, June

Juergen Freund / Split-level shot of Green turtle (Chelonia mydas) in the reef shallows, swimming towards the camera. Sipadan Island, Sabah, Malaysia, June

Juergen Freund / Split-level shot of mating pair of Green turtles (Chelonia mydas) in the reef shallows. Sipadan Island, Sabah, Malaysia, June

Juergen Freund / Green turtle (Chelonia mydas) seen from above, swimming away from the camera. Sipadan Island, Semporna, Sabah, Malaysia, June

Juergen Freund / Split level shot of mating Green turtles (Chelonia mydas) in the reef shallows. Sipadan Island, Sabah, Malaysia, June

Juergen Freund / Green turtle (Chelonia mydas) portrait. Sipadan Island, Semporna, Sabah, Malaysia

Juergen Freund / Four Green turtles (Chelonia mydas) looking for resting places on the reef. Sipadan Island, Semporna, Sabah, Malaysia, June

Juergen Freund / Green turtle (Chelonia mydas) swimming through the sea near a coral reef, seen from above. Sipadan Island, Semporna, Sabah, Malaysia, June

Onne van der Wal / Young man snorkeling with a Green turtle (Chelonia mydas) in the Grenadines, Caribbean, February 2010. Model Released.

Onne van der Wal / Green turtle (Chelonia mydas) swimming over sea grass, Grenadines, Caribbean, February 2010.

Pete Oxford / Galapagos green turtle (Chelonia mydas agassizi) swimming underwater, off Wolf Island, Galapagos, Ecuador, South America

Pete Oxford / Steel pompano fish (Trachinotus stilbe) cleaning Galapagos green turtle (Chelonia mydas agassizi) off Wolf Island, Galapagos Islands