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

Avijan Saha/ BIA / Indian Rhinoceros (Rhinoceros unicornis) crossing road, Jaldapara National Park, India

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.

Pete Oxford / White Rhinoceros (Ceratotherium simum) mother and calf with Red-billed Oxpeckers (Buphagus erythrorhynchus), South Africa

ZSSD / Indian Rhinoceros (Rhinoceros unicornis) male calf, San Diego Zoo Safari Park, California

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