Neil Aldridge / A young White rhinoceros (Ceratotherium simum) leaves a secure enclosure known as a boma in the Okavango Delta, northern Botswana, after being translocated from South Africa as part of efforts to rebu...

Neil Aldridge / White rhinoceros (Ceratotherium simum) male and female, face to face, Mosi Oa Tunya National Park, Zambia.

Neil Aldridge / Black rhinoceros (Diceros bicornis) stands in evening light on Chief's Island in Okavango Delta, Botswana,. This rhino was released in the Okavango Delta as part of efforts to rebuild the rhino popula...

Neil Aldridge / White rhinoceros (Ceratotherium simum) with a long horn, Marakele National Park, South Africa.

Suzi Eszterhas / Cotton-top tamarin (Saguinus oedipus), three climbing tree. Northern Colombia.

Suzi Eszterhas / Cotton-top tamarin (Saguinus oedipus), adult with two week old baby on back. Northern Colombia.

Matthew Maran / Delacour's langurs (Trachypithecus delacouri) resting, Van Long Nature Reserve,Ninh Binh, Vietnam. Critically endangered

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

Lorraine Bennery / Blue-eyed lemur (Eulemur flavifrons) male looking down from branch. Sahamalaza, Madagascar.

Lorraine Bennery / Blue-eyed lemur (Eulemur flavifrons) female in tree. Sahamalaza, Madagascar.

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

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