David Fleetham / Hawksbill Turtle (Eretmochelys imbricata) and a shoal of fish near sea surface. Tubbataha Reef, Philippines.

Solvin Zankl / Baby Olive Ridley sea turtle (Lepidochelys olivacea) struggles against the swell to swim away from the beach where it hatched, Ostional, Costa Rica. October. Winner of the Underwater category of the G...

Wild Wonders of Europe / Zankl / Loggerhead turtle (Caretta caretta) hatching, Dalyan Delta, Turkey, July 2009

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

Inaki Relanzon / Hawksbill turtle (Eretmochelys imbricata) swimming underwater, Nosy Be, North Madagascar.

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

Sergio Hanquet / Loggerhead turtle (Caretta caretta) young animal tangled in fishing net. Tenerife, Canary Islands. 2019.

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 / Coral (Lobophytum sp.) on a reef flat, with Hawksbill turtle (Eretmochelys imbricata) in background. Misool, Raja Ampat, West Papua, Indonesia. Ceram Sea. Tropical West Pacific Ocean.

Alex Mustard / Hawksbill turtle (Eretmochelys imbricata) unusually feeding on hard coral polyps. Misool, Raja Ampat, West Papua, Indonesia. Ceram Sea. Tropical West Pacific Ocean.

Alex Mustard / Carapace of a dead olive Ridley turtle (Lepidochelys olivacea) entangled in discarded fishing gear. Indian Ocean, off Sri Lanka.

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

Shane P. White / Leatherback Sea Turtle (Dermochelys coriacea) female returning to sea after egg laying, Trinidad and Tobago, Caribbean

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

Ralph Pace / Olive Ridley Sea Turtle (Lepidochelys olivacea) females coming ashore to nest during arribada, Playa de Escobilla Sanctuary, Oaxaca, Mexico

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

Doug Perrine / Pacific leatherback sea turtle (Dermochelys coriacea) a critically endangered species, Kei ( or Kai ) Islands, Moluccas, eastern Indonesia, Banda Sea, Southwest Pacific Ocean

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.

Seth Patterson / A compilation of items found washed up along a half mile stretch of the high tide line of South Padre Island, Texas. October 2016. Some of the plastic bottles and bags of signs of nip marks from hun...

Shane P. White / Leatherback Sea Turtle (Dermochelys coriacea) females laying eggs on beach at sunset, Trinidad and Tobago, Caribbean

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.

Alex Mustard / Hawksbill turtle (Eretmochelys imbricata) pair circling each other above coral reef. Seven Mile Beach, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Claudio Contreras / Olive Ridley Sea Turtle (Lepidochelys olivacea) nesting, Arribada (mass nesting event), Playa Morro Ayuta, Oaxaca state, southern Mexico. Vulnerable species.

Jordi Chias / Hawksbill turtle (Eretmochelys imbricata) feeding on coral, South Ari Atoll, Maldives Islands, Indian ocean.

Jordi Chias / Hawksbill turtle (Eretmochelys imbricata) Port El Ghalib, Egypt, Red Sea.

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'...

Ingo Arndt / Villagers collecting eggs from Olive ridley sea turtles (Lepidochelys olivacea) during the first two days of the arribada (mass nesting event). This is the only place in the world where it is legal to...

Ingo Arndt / Olive ridley sea turtles (Lepidochelys olivacea) digging their nests by night with stars during an arribada (mass nesting event) to lay eggs, Pacific Coast, Ostional, Costa Rica.

Ingo Arndt / Olive ridley sea turtles (Lepidochelys olivacea) females coming ashore at twilight during an arribada (mass nesting event) to lay eggs, Pacific Coast, Ostional, Costa Rica.

Ingo Arndt / Olive ridley sea turtles (Lepidochelys olivacea) females coming ashore during an arribada (mass nesting event) to lay eggs, Pacific Coast, Ostional, Costa Rica.

Rolf Nussbaumer / Kemp's ridley sea turtle (Lepidochelys kempii), baby turtle walking towards sea, South Padre Island, South Texas, USA. July

Alex Mustard / Hawksbill turtle (Eretmochelys imbricata) male chomps on soft coral. Jackson Reef, Sinai, Egypt. Strait of Tiran, Red Sea.

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 / Hawksbill turtle (Eretmochelys imbricata) swimming, viewed from below, Cozumel Reefs National Park, Cozumel Island, Yucatan Peninsula, Mexico, February

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 / Hawksbill turtle (Eretmochelys imbricata) swimming at night. East End, Grand Cayman, Cayman Islands. Caribbean Sea.

Alex Mustard / Hawksbill turtle (Eretmochelys imbricata) cruising along the drop off of a coral reef. Bloody Bay Wall, Little Cayman, Cayman Islands. Caribbean Sea. NB. Turtle has two identification tags in its fron...

Alex Mustard / Hawksbill turtle (Eretmochelys imbricata) male swimming in open water above a coral reef. Tank Rock, Fiabacet, Misool, Raja Ampat, West Papua, Indonesia. Ceram Sea, Tropical West Pacific Ocean.

Alex Mustard / Hawksbill turtle (Eretmochelys imbricata) on a reef wall with a rope sponge. East End, Grand Cayman, Cayman Islands. Caribbean Sea.

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

Wild Wonders of Europe / Zankl / Loggerhead sea turtle (Caretta caretta) emerging from shell, Dalyan delta, Turkey, July.

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 / Leatherback turtle (Dermochelys coriacea) hatchlings running to the sea from nest. Jamursbamedi, West Papua, Irian Jaya, Indonesia.

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 / Hawksbill turtle (Eretmochelys imbricata) swimming over reef, Red Sea, Egypt

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.

Jordi Chias / Loggerhead turtle (Caretta caretta) swimming near the surface, Balearic channel, Spain.

Jordi Chias / Loggerhead turtle (caretta caretta) swimming near the surface with Pilot fish. Balearic channel, Spain.

Jordi Chias / Loggerhead turtle (Caretta caretta) swimming near the surface, Balearic channel, Spain.

Jordi Chias / Loggerhead turtle (Caretta caretta) Santa Maria Island; Azores archipelago, Atlantic ocean

Jordi Chias / Loggerhead turtle (Caretta caretta) Los Gigantes, South Tenerife, Canary Islands, Atlantic Ocean.

Jordi Chias / Underwater cameraman filming Loggerhead turtle (Caretta caretta) Los Gigantes, South Tenerife, Canary Islands, Atlantic Ocean.