Officials have tried a variety of conservation efforts with mixed success.

Officials have tried a variety of conservation efforts with mixed success. TOP LEFT Antipoaching forces stage a mock capture and arrest of poachers on a South African game farm in 2010. TOP RIGHT A drugged black rhinoceros in South Africa’s Ithala Game Reserve being moved to a safer location by helicopter. BOTTOM An orphaned baby white rhinoceros being fed at Lewa Wildlife Conservancy, Kenya.

EPA European Pressphoto Agency B.V./Alamy Stock Photo; Martin Harvey/Alamy Stock Photo