Both black and white rhinoceroses are actually gray. They are different not in color but in lip shape. The black rhino has a pointed upper lip, while its white relative has a squared lip.

The men take pictures ... the Rhino Trust is to protect the black rhinoceros from poachers," says Lesley Karutjaiva, the 47-year-old head of the group's base in Palmwag in north-western Namibia.