Andrew Walmsley / Sumatran orangutan (Pongo abelii) mother and baby Bukit Lawang, North Sumatra.

Jabruson Motion / Conservation workers carrying a sedated Sumatran orangutan (Pongo abelii) towards vehicles and a transport box, part of a relocation programme, Sei Serdang, Prima, Batang Serangan, Langkat, North Suma...

Tim Laman / Tapanuli orangutan (Pongo tapanuliensis) Togus, adult flanged male, Batang Toru Forest. Sumatran Orangutan Conservation Project, North Sumatran Province, Indonesia.

Tim Laman / Tapanuli Orangutan (Pongo tapanuliensis). Togus, adult flanged male Batang Toru Forest Sumatran Orangutan Conservation Project North Sumatran Province Indonesia

Tim Laman / Tapanuli Orangutan (Pongo tapanuliensis). Togus, adult flanged male. Batang Toru Forest, Sumatran Orangutan Conservation Project, North Sumatran Province, Indonesia.

Tim Laman / Tapanuli Orangutan (Pongo tapanuliensis) Beti, juvenile female, daughter of Beta, in the trees, Batang Toru Forest, Sumatran Orangutan Conservation Project, North Sumatran Province, Indonesia

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

Shane Gross / Cuban crocodile (Crocodylus rhombifer) in a cenote in Cienaga de Zapata National Park. Cuba. Critically endangered species.

Shane Gross / Cuban crocodile (Crocodylus rhombifer) in a cenote in Cienaga de Zapata National Park. Cuba. Critically endangered species.

Enrique Lopez-Tapia / Tourists riding Bactrian camels (Camelus bactrianus) in sand dunes, Nubra Valley. Ladakh, India, September 2018.

Enrique Lopez-Tapia / Man leading Bactrian camels (Camelus bactrianus) in sand dunes, Nubra Valley. Ladakh,,India, September 2018.

Enrique Lopez-Tapia / Bactrian camels (Camelus bactrianus) on sand, Nubra Valley, Ladakh, India. September.

Jurgen Freund / Bleached Staghorn corals (Acropora cervicornis), Great Barrier Reef, Australia, 2017.

Sandesh Kadur / Pair of Waved albatrosses (Phoebastria irrorata) displaying, tapping beaks, Galapagos Islands, Ecuador.

Magnus Lundgren / Wild Wonders of China / Central Yunnan black crested gibbon (Nomascus concolor jingdongensis), mother and baby hanging in canopy. Wuliangshan Nature Reserve, Jingdong, Yunnan Province, China.

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.

Tui De Roy / Waved albatross (Phoebastria irrorata) on nest, with fish hook in throat, Punta Suarez, Espanola Island, Galapagos.

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.

Lucas Bustamante / Rio pescado harlequin toad (Atelopus balios) pair on branch, female on the left, Azuay, Ecuador, Critically endangered species, possibly extinct.

Eric Baccega / Mountain gorilla (Gorilla beringei beringei) juvenile female stretching hand out towards camera, member of the Kabirizi group, Virunga National Park, North Kivu, Democratic Republic of Congo, Africa,...

Yashpal Rathore / Kottigehar dancing frog (Micrixalus kottigeharensis) male calling and displaying to attract female by waving foot, Agumbe, Western Ghats, India.

Yashpal Rathore / Kottigehar dancing frog (Micrixalus kottigeharensis) male calling and displaying to attract female by waving foot, Agumbe, Western Ghats, India.

Ann & Steve Toon / White rhino (Ceratotherium simum) at waterhole at night, Zimanga Private Game Reserve, KwaZulu-Natal, South Africa.

Ann & Steve Toon / White rhino (Ceratotherium simum) at waterhole drinking at night, Zimanga Private Game Reserve, KwaZulu-Natal, South Africa.

Jabruson Motion / Male Western gorilla (Gorilla gorilla) displaying, throws clump of grass into the air, runs through bai and hits other gorilla, Maya Nord Bai, Odzala-Kokoua National Park, Cuvette-Ouest Region, Republ...

Francisco Marquez / Pair of Iberian lynxes (Lynx pardinus) greeting, Andalusia, Spain, January.

Gerrit Vyn / Mature male California Condor (Gymnogyps californianus) used for the captive breeding program to restore this critically endangered species. Idaho. February.

Neil Aldridge / White rhinoceros (Ceratotherium simum) calf keeping close to its mother on Kariega Game Reserve, South Africa.

Neil Aldridge / White rhinoceros (Ceratotherium simum) female 'Thandi' silhouetted against the sunset, Kariega Game Reserve. South Africa. Thandi's horns were taken in a brutal attack by poachers.

Alex Hyde / Lemur leaf frog (Agalychnis lemur) Central Caribbean foothills, Costa Rica. IUCN Red List critically endangered species.

Jabruson Motion / Silverback Western lowland gorilla (Gorilla gorilla gorilla) feeding on grass in forest bai, Odzala-Kokoua National Park, Cuvette-Ouest, Republic of Congo.

Jabruson Motion / Silverback Western lowland gorilla (Gorilla gorilla gorilla) leaving bai for forest with female and infant, crossing river bipedally, Odzala-Kokoua National Park, Cuvette-Ouest, Republic of Congo.

Jabruson Motion / Close up of a female Western lowland gorilla (Gorilla gorilla gorilla) female feeding on grasses in bai, Odzala-Kokoua National Park, Cuvette-Ouest, Republic of Congo.

Jabruson Motion / Close-up of a blackback Western lowland gorilla (Gorilla gorilla gorilla) feeding, Odzala-Kokoua National Park, Cuvette-Ouest, Republic of Congo.

Jabruson Motion / Female Western lowland gorilla (Gorilla gorilla gorilla) with very young infant, interacts with another gorilla, Odzala-Kokoua National Park, Cuvette-Ouest, Republic of Congo.

Jabruson Motion / Female Western lowland gorilla (Gorilla gorilla gorilla) feeding with blackback in forest bai, Odzala-Kokoua National Park, Cuvette-Ouest, Republic of Congo.

Jabruson Motion / Juvenile male Sumatran orangutan (Pongo abelii) 'Januar' taking banana from keeper, Bukit Lawang Orangutan Sanctuary, Gunung Leuser National Park, North Sumatra, Indonesia.

Jabruson Motion / Female Sumatran orangutan (Pongo abelii) 'Juni' feeding, drinking milk from a cup, with male baby 'Januar' aged 18 months, Bukit Lawang Orangutan Sanctuary, Gunung Leuser National Park, North Sumatra,...

Jabruson Motion / Female Sumatran orangutan (Pongo abelii) 'Wati' feeding on ants, with a juvenile wanting to join in, Bukit Lawang Orangutan Sanctuary, Gunung Leuser National Park, North Sumatra, Indonesia.

Jabruson Motion / Female Sumatran orangutan (Pongo abelii) 'Wati' feeding on ants with a juvenile, Bukit Lawang Orangutan Sanctuary, Gunung Leuser National Park, North Sumatra, Indonesia.

Jabruson Motion / Female Sumatran orangutan (Pongo abelii) 'Wati' feeding on ants, Bukit Lawang Orangutan Sanctuary, Gunung Leuser National Park, North Sumatra, Indonesia.

Jabruson Motion / Female Sumatran orangutan (Pongo abelii) 'Wati' feeding on ants, Bukit Lawang Orangutan Sanctuary, Gunung Leuser National Park, North Sumatra, Indonesia.

Jabruson Motion / Female Sumatran orangutan (Pongo abelii) 'Wati' moving through canopy, Bukit Lawang Orangutan Sanctuary, Gunung Leuser National Park, North Sumatra, Indonesia.

Wim van den Heever / Black rhinoceros (Diceros bicornis) mother and calf having a drink at night with perfect reflections. Etosha National Park, Namibia. Taken with infrared camera.

Wim van den Heever / Black rhinoceros (Diceros bicornis) bull having a drink at night with perfect reflections. Etosha National Park, Namibia. Taken with Infrared camera.

Edwin Giesbers / Brown headed spider monkey (Ateles fusciceps) mother and baby, captive occurs in Central and South America.

Edwin Giesbers / Brown headed spider monkey (Ateles fusciceps) group resting together, captive occurs in Central and South America.