The Ol Pejeta Conservancy is the largest sanctuary for black rhinos in East Africa. It is also home to the “big five” as well as many rare and endangered species, such as the white rhino, Jackson’s hartebeest and Grevy’s zebra. The conservancy has a higher wildlife-to-area ratio than any Kenyan national park. A program of controlled grazing by boran cattle and monitoring and maintaining optimum pastures for wildlife and cattle has enhanced the bio-diversity. The Chimpanzee Sanctuary, the only one in Kenya, shelters chimps in a large natural enclosure.