This leucistic impala was photographed in the Kruger National Park, South Africa. It is not 'albino' but 'leucistic' which is a rare genetic condition in the pigment of the animal's hair and skin characterised by lack of pigmentation. This can result in unusual white patches appearing on the animal, or, more rarely, completely white creatures.
It is easy to distinguish between albinism and leucism as in albinism the eye colour is red with the underlying blood vessels showing through. Leucistic animals have normally coloured eyes. This mutation appears to be due to hidden recessive genes. The lack of tawny camouflage needed for survival makes them more visible to predators.
Information source: http://hesc.co.za/2015/08/impala-with-a-difference