Black rhino sunset, Kwandwe, Eastern Cape, South Africa. Throughout most of the 20th century, the Black Rhino was the most numerous of the world's rhino species and at one stage could have numbered around 850,000. Two years ago a subspecies, the Western black rhino, was declared extinct. They now numbers around 6000. Last stronghold of the black and white rhinoceros is South Africa, where last year 668 rhinos were killed to feed the demand for rhino horn from China and Vietnam.