Black rhinoceros or hook-lipped rhinoceros (Diceros bicornis) male at waterhole, South African Giraffe (Giraffa camelopardalis giraffa) behind, Etosha National Park, Namibia, Africa

Black rhinoceros or hook-lipped rhinoceros (Diceros bicornis) male near waterhole, attentively observed by male South African Giraffe (Giraffa camelopardalis giraffa), Etosha National Park, Namibia, Africa

Black rhinoceros or hook-lipped rhinoceros (Diceros bicornis) cow with calf at floodlit waterhole of Okaukuejo Camp during night, Etosha National Park, Namibia, Africa

Black-Faced Impala (Aepyceros melampus petersi), male, drinking at a waterhole in the last light of the evening, Etosha National Park, Namibia, Africa

Black-Faced Impala (Aepyceros melampus petersi), male, drinking at a waterhole in the last light of the evening, Etosha National Park, Namibia, Africa

"Black Rhinoceros (Diceros bicornis), male walking in dry grass, Etosha National Park, Namibia, Africa"

"Black Rhinoceros (Diceros bicornis), male walking in dry grass, Etosha National Park, Namibia, Africa"

"Black Rhinoceros (Diceros bicornis), male walking in dry grass, Etosha National Park, Namibia, Africa"

"Black Rhinoceros (Diceros bicornis), male standing in dry grass, Etosha National Park, Namibia, Africa"

"Black Rhinoceros (Diceros bicornis), at the Rietfontein waterhole, Etosha National Park, Namibia, Africa"

"Black Rhinoceros (Diceros bicornis), adult male standing in dry grass at waterhole, Etosha National Park, Namibia, Africa"

"Black Rhinoceros (Diceros bicornis), male, and Burchell's Zebras (Equus burchelli), at waterhole, Etosha National Park, Namibia, Africa"

"Giraffe (Giraffa camelopardalis) and Black or Hook-lipped Rhinoceros (Diceros bicornis) at waterhole at night, Etosha National Park, Namibia, Africa"

Black Rhinoceros (Diceros bicornis), adult male, rolling in the dust, Etosha National Park, Namibia, Africa

"Black Rhinoceros (Diceros bicornis), adult male, standing in dry grass, Etosha National Park, Namibia, Africa"

"Black Rhinoceros (Diceros bicornis), adult male, and Burchell's Zebras (Equus burchelli) standing at waterhole, Etosha National Park, Namibia, Africa"

"Black Rhinoceros (Diceros bicornis), adult male, and Burchell's Zebra (Equus burchelli) standing at waterhole, Etosha National Park, Namibia, Africa"

Black rhinoceros or hook-lipped rhinoceros (Diceros bicornis) male drinking at waterhole, evening light, Etosha National Park, Namibia, Africa