Tui De Roy / Black rhino (Diceros bicornis) with very long horn, Lewa Wildlife Conservancy, Laikipia, Kenya. October.

Tui De Roy / Black rhino (Diceros bicornis) and White rhino (Ceratotherium simum), being harrassed by playfighting White rhino bull, Solio Game Reserve, Laikipia, Kenya. September.

Tui De Roy / Black rhino (Diceros bicornis) and White Rhino (Ceratotherium simum) bulls facing off. Solio Game Reserve, Laikipia, Kenya. September.

Tui De Roy / Three White rhinoceroses (Ceratotherium simum) walking together, Solio Game Reserve, Laikipia, Kenya. September.

Tui De Roy / Three White rhinoceroses (Ceratotherium simum), Solio Game Reserve, Laikipia, Kenya. September.

Will Burrard-Lucas / Black rhinoceros (Diceros bicornis) mother and calf, Lewa & Borana Conservancy, Kenya.

Will Burrard-Lucas / White rhino (Ceratotherium simum) female and juvenile, Solio Game Reserve, Solio Ranch, Kenya. Taken with remote camera buggy / BeetleCam. EDITORIAL USE ONLY. All other uses require clearance

Will Burrard-Lucas / White rhinoceroses (Ceratotherium simum) with calf playing with adult, Solio Game Reserve, Solio Ranch, Kenya. Taken with remote camera buggy / BeetleCam. EDITORIAL USE ONLY. All other uses require cl...

Will Burrard-Lucas / White rhino (Ceratotherium simum), portrait. Solio Game Reserve, Solio Ranch, Kenya. Taken with remote camera buggy / BeetleCam. EDITORIAL USE ONLY. All other uses require clearance

Will Burrard-Lucas / White rhino (Ceratotherium simum), portrait. Solio Game Reserve, Solio Ranch, Kenya. Taken with remote camera buggy / BeetleCam. EDITORIAL USE ONLY. All other uses require clearance

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) mother and calf, prepare to leave a boma - a secure enclosure - in the Okavango Delta in northern Botswana after being translocated from South Africa as part of...

Neil Aldridge / Blindfolded and tranquilised adult White rhinoceros (Ceratotherium simum) with a tracking tag lies and recovers in the Okavango Delta, northern Botswana, following a translocation operation that invol...

Neil Aldridge / Five orphaned White rhinoceros (Ceratotherium simum) calves feed from a trough at dusk at the Rhino Revolution orphanage near Hoedspruit, South Africa. The mothers of these rhinos were killed by poach...

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

Neil Aldridge / Team of vets and conservation staff move a sedated White rhinoceros (Ceratotherium simum) into a comfortable resting position in a secure enclosure known as a boma during a translocation operation to...

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.

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.

Neil Aldridge / Black rhinoceros (Diceros bicornis) feeding in early morning light, Kariega Game Reserve. South Africa.

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.

Eric Baccega / African elephant (Loxodonta africana) and black rhinoceros (Diceros bicornis) bathing at waterhole at night with moon, Okaukuejo, Etosha National Park, Namibia, Africa. Taken with infrared camera.

Eric Baccega / Angolan giraffes (Giraffa camelopardalis angolensis) and black rhinoceros (Diceros bicornis) reflecting in waterhole at sunset, Okaukuejo, Etosha National Park, Namibia, Africa

Staffan Widstrand / White rhinoceros (Ceratotherium simum) close up portrait, iMfolozi National Park, South Africa

Roland Seitre / Black rhinoceroses (Diceros bicornis) swimming acorss river, Zimbabwe.

Ann & Steve Toon / White rhinoceros calf (Ceratotherium simum), Mkhuze Game Reserve, KwaZulu-Natal, South Africa, May

Suzi Eszterhas / Indian rhinoceros (Rhinoceros unicornis) mother and calf (age 1-2 weeks) Kaziranga National Park, India.

Tony Heald / Indian rhinoceros (Rhinoceros unicornis) mother and calf, rear view. Kaziranga National Park, Assam, India. Vulnerable species

Cyril Ruoso / Close up of Sumatran rhinoceros (Dicerorhinus sumatrensis) female close up, part of a breeding program, Way Kambas National Park, Sumatra, Indonesia.

Cyril Ruoso / Close up of Sumatran rhinoceros (Dicerorhinus sumatrensis) female feeding, part of a breeding program, Way Kambas National Park, Sumatra, Indonesia.

Denis-Huot / Indian rhinoceros (Rhinoceros unicornis), male, Kaziranga National Park, Assam, India

Denis-Huot / Black rhinoceros (Diceros bicornis) female and young in the mud, Masai-Mara Game Reserve, Kenya. February.

Denis-Huot / Male black rhinoceros (Diceros bicornis) silhouetted against clouds, Masai-Mara Game Reserve, Kenya. March.

Pete Oxford / White rhinoceros calf (Ceratotherium simum) Great Karoo. Private Reserve, South Africa. Endangered species

Denis-Huot,Denis-Huot / Black rhino (Diceros bicornis) looking threatening, Nakuru National Park, Kenya

Denis-Huot,Denis-Huot / White rhino (Ceratotherium simum) in the rain, Nakuru National Park, Kenya

Denis-Huot / White rhino (Ceratotherium simum) Nakuru National Park, Kenya

Denis-Huot / White rhino (Ceratotherium simum) female portrait, portrait, Nakuru National Park, Kenya

Denis-Huot,Denis-Huot / White rhino (Ceratotherium simum) mother and baby grazing, Nakuru National Park, Kenya

Denis-Huot / White rhino (Ceratotherium simum) mother and baby grazing, Nakuru National Park, Kenya

Ann & Steve Toon / Black rhinoceros (Diceros bicornis) on savanna, Lewa Wildlife Conservancy, Laikipia, Kenya

Staffan Widstrand / White rhinoceros (Cerathorium simum) watched by anti-poaching patrol of iMfolozi National Park, South Africa October 2011

Uri Golman / White rhinoceros (Ceratotherium simum) mother and calf browsing. Entabeni Safari Conservancy, Limpopo region, Waterberg, South Africa, October

Tony Heald / Black rhinoceros (Diceros bicornis) Etosha National Park, Namibia October