A black rhino in the Salient of the Aberdare National Park. Its skin colour is the result of the mud-wallows it frequents in the bright red soil of the area.A red-billed oxpecker (Buphagus erythorhynchus) or 'tick bird' perches on the animal's back. As its name implies, it feeds on ticks and blood-sucking flies while keeping wounds on the host animal open.