"An onslaught of poaching, particularly during the 1970s, changed that picture with appalling rapidity. Numbers fell to 65,000 by 1970, 14,785 by 1980, 8,800 by 1984, 3,665 by 1987 and 3,450 by 1991. In 1992, after a 28 percent decline in a single year, there were only 2,475 left. The Black Rhinoceros has earned, in the words of Nigel Leader-Williams, ‘the dubious distinction of showing the fastest known rate of recline of any species of large mammal. Poachers slaughtered every one of the thousands of animals that roamed the vast spaces of Kenya’s Tsavo, then shifted south through the Selous in Tanzania to the Luangwa Valley of Zambia, where they had killed all of its estimated 4,000-8,000 rhinos by the end of the 1980s.”