months before parting ways. While females stay close to their mothers, males move farther off. The lifespan of wild cheetahs is 14 to 15 years for females, and their reproductive cycle typically ends by 12 years of age; males generally live as long as ten years. Distribution and habitat Cheetahs appear to be less selective in habitat choice than other felids and inhabit a variety of ecosystems; areas with greater availability of prey, good visibility and minimal chances of encountering larger predators are preferred. They seldom occur in tropical forests. Cheetahs have been reported at elevations as high as . An open area with some cover, such as diffused bushes, is probably ideal for the cheetah because it needs to stalk and pursue its prey over a distance. This also minimises the risk of encountering larger carnivores. Unlike the big cats, the cheetah tends to occur in low densities typically between 0.3 and 3.0 adults per —these values are 10–30% of those reported for leopards and lions. Cheetahs in eastern and southern Africa occur mostly in savannas like the Kalahari and Serengeti. In central, northern and western Africa cheetahs inhabit arid mountain ranges and valleys; in the harsh climate of the Sahara, cheetahs prefer high mountains, which receive more rainfall than the surrounding desert. The vegetation and water resources in these mountains supports antelopes. Iranian cheetahs occur in hilly terrain of deserts at elevations up to , where annual precipitation is generally below ; the primary vegetation in these areas is thinly distributed shrubs, less than tall. Historical range In prehistoric times, the cheetah was distributed throughout Africa, Asia and Europe. It gradually fell to extinction in Europe, possibly because of competition with the lion. Today the cheetah has been extirpated in most of its historical range; the numbers of the Asiatic cheetah had begun plummeting since the late 1800s, long before the other subspecies started their decline. As of 2017, cheetahs occur in just nine per cent of their erstwhile range in Africa, mostly in unprotected areas. In the past until the mid-20th century, the cheetah ranged across vast stretches in Asia, from the Arabian Peninsula in the west to the Indian subcontinent in the east, and as far north as the Aral and Caspian Seas. A few centuries ago the cheetah was abundant in India, and its range coincided with the distribution of major prey like the blackbuck.