Mark Carwardine / Black rhinoceros (Diceros bicornis) - darted and being prepared for translocation by rangers from the Kenya Wildlife Service, being measured Nairobi National Park, Kenya, Endangered / threatened spec...

Tony Heald / White rhinoceros [Ceratotherium simum] at water, Etosha National Park, Namibia, August

Tony Heald / Black Rhinoceros [Diceros bicornis] drinking, Etosha National Park, Namibia, August

Mark Carwardine / Black rhinoceros (Diceros bicornis) calf, hand reared, Endangered species, Mkhaya Game Reserve, Swaziland

Mark Carwardine / Southern white rhinoceros (Ceratotherium simum simum) beside water, Endangered species, Mkhaya Game Reserve, Swaziland

Mark Carwardine / Southern white rhinoceros (Ceratotherium simum simum) drinking, Endangered species, Mkhaya Game Reserve, Swaziland

Mark Carwardine / Southern white rhinoceros (Ceratotherium simum simum) beside water, Endangered species, Mkhaya Game Reserve, Swaziland

Mark Carwardine / Northern white rhinoceros (Ceratotherium simum cottoni) with horn removed, after initial release into the wild, Ol Pejeta Conservancy, Kenya, June 2010, Extinct in the wild, only eight left in captivi...

Mark Carwardine / Northern white rhinoceros (Ceratotherium simum cottoni) close-up of eye, Dvur Kralove Zoo, Czech Republic, December 2009, Extinct in the wild, only eight left in captivity, critically endangered, Part...

Mark Carwardine / Northern white rhinoceros (Ceratotherium simum cottoni) close up of eye, in enclosure at Dvur Kralove Zoo, Czech Republic, the day before departure, December 2009, Extinct in the wild, only eight left...

Martin Dohrn / Lions (Panthera leo) approaching rhinoceros, Masai Mara, Kenya. Photographed at night using 'Starlight Camera' technology without artificial lighting.

Bernard Castelein / Indian Rhinoceros (Rhinoceros unicornis) grazing, Kaziranga NP, Assam, India