Tui De Roy / Alcedo giant tortoise (Chelonoidis vandenburghi) walking, Alcedo Volcano, Isabela Island, Galapagos

Tui De Roy / Alcedo giant tortoise (Chelonoidis vandenburghi) group resting in pool, Alcedo Volcano, Isabela Island, Galapagos

Graham Eaton / Leatherback Turtle (Dermochelys coriacea) hatchling approaching the sea. Cayenne, French Guiana, July.

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

Andy Rouse / Krefft's River Turtle (Emydura macquarii krefftii) at surface of in rainforest pond, Queensland, Australia

Michel Roggo / Florida red-bellied turtle (Pseudemys nelsoni) Rainbow Springs, Rainbow Springs State Park, Florida, USA. March 2011. Photographed for The Freshwater Project

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

Solvin Zankl / As soon as it entered the water the young Olive ridley sea turtle (Lepidochelys olivacea) struggles against the swell to swim away from the coast. The swimming frenzy lasts for approximately 48 hours...

Jen Guyton / East African black mud turtle (Pelusios subniger) in seasonal pond. Gorongosa National Park, Mozambique. Cropped image

Jordi Chias / Loggerhead turtle (Caretta caretta) with small fish, Los Gigantes, South Tenerife, Canary Islands, Atlantic

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...

Jordi Chias / Loggerhead turtle (Caretta caretta) trapped in a drifting abandoned net, Mediterranean Sea. (Winner of the One Earth Award, WPY Competition 2010 )

Tony Wu / Olive ridley turtle (Lepidochelys olivacea) female entangled in a very large ghost fishing net in the Indian Ocean. She was successfully released. March 2014

Michael Pitts / Dead Green Turtle (Chelonia mydas) entangled in rope floating at the sea surface. Near Karan Island, Arabian Gulf.

Huw Cordey / Marine litter - mostly shoes (flip flops) and plastic bottles washed up on shore with Aldabra giant tortoise (Aldabrachelys gigantea). Cinq Cases, Aldabra Island, Indian Ocean

John Cancalosi / Snapping turtle (Chelydra serpentina) and Painted turtle (Chrysemys picta) with discarded plastic bottle, Maryland, USA. July. Label on bottle digitally removed.

John Cancalosi / Snapping turtle (Chelydra serpentina) in blue-green algal bloom (Woronichinia naegeliana). Microcystin produced is toxic to wildlife and humans. Maryland, USA. October 2018.

Juergen Freund / Papuan boy swimming in the shallows with his pet baby hawksbill turtle (Eretmochelys imbricata). Tunnung Island, New Hanover, Papua New Guinea, June 2010

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

Solvin Zankl / A Costa Rican researcher monitors the temperature in the developing Olive Ridley sea turtle nests at Ostional beach, Costa Rica, November 2009. ^^^ Sea turtles have, like many other reptiles, temperat...

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

Graham Eaton / Leatherback Turtle Hatchling (Dermochelys coriacea) crossing a beach towards the sea, Cayenne, French Guiana, July

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...

Daniel Heuclin / Green sea turtle (Chelonia mydas) digging nest to lay eggs on beach, French Guiana.

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

Ingo Arndt / Olive ridley sea turtle (Lepidochelys olivacea) hatchlings emerge from the nest, Pacific Coast, Ostional, Costa Rica.

Graham Eaton / Leatherback Turtle (Dermochelys coriacea) returning to the sea after egg laying. Cayenne, French Guiana, June.

Solvin Zankl / Olive ridley sea turtle hatchling (Lepidochelys olivacea) showing egg tooth that helps the hatchling to open the soft but tough egg shell. Ostional beach, Costa Rica, November

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

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.

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

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...

Graham Eaton / Leatherback Turtle Hatchling (Dermochelys coriacea) crossing a beach towards the sea, seen from above. Cayenne, French Guiana, July.

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.

Graham Eaton / Leatherback Turtle (Dermochelys coriacea) hatchling crossing a beach to get to the sea. Cayenne, French Guiana, July.

Ingo Arndt / Olive ridley sea turtle (Lepidochelys olivacea) hatchlings emerge from the nest and making their way to the sea at sunrise, Pacific Coast, Ostional, Costa Rica.

Jordi Chias / Loggerhead turtle (Caretta caretta) surrounded by other small fish, Los Gigantes, South Tenerife, Canary Islands, Atlantic

Juergen Freund / Portrait of newly hatched Leatherback turtle (Dermochelys coriacea) baby. Warmamedi beach, Bird's Head Peninsula, West Papua, Indonesia, July 2009.

Juergen Freund / Leatherback turtle (Dermochelys coriacea) female laying her clutch of eggs. Warmamedi beach, Bird's Head Peninsula, West Papua, Indonesia, July 2009.

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

Juergen Freund / Leatherback turtle eggs weighed and measured before relocation-burying to hatchery by State Universiti of Papua (UNIPA) students and WWF staff Daro Tadu. Warmamedi beach, Bird's Head Peninsula, West P...

Graham Eaton / Leatherback Turtle Hatchling (Dermochelys coriacea) crossing a beach towards the sea, Cayenne, French Guiana, July

Doug Perrine / Green sea turtle (Chelonia mydas) hatchling swimming, Endangered, Caribbean, captive, digitally enhanced

Ingo Arndt / Close up of fin of Loggerhead turtle {Caretta caretta}

Pete Oxford / Leatherback female returning to sea {Cermochelys coriacea} Grande Riviere, Trinidad

Juergen Freund / Green turtle (Chelonia mydas) digging nest. Turtle Islands, Philippines

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

Alex Mustard / Portrait of female Hawksbill turtle (Eretmochelys imbricata) in the coral reef. Ras Mohammed Marine Park, Sinai, Egypt. Red Sea