Cheetahs, the world's fast mammals, are racing towards extinction. In 1975, 14,000 cheetahs roamed Africa. Today there are only 7,100 cheetahs left in all of Africa and only 600 in Kenya. The biggest reason for their decline here is the fencing off of Kenya's wild spaces. Uncontrolled development cuts off the wildlife corridors needed by this most endangered of the big cats.