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Lions are the laziest of the divercompass big cats. They usually spend 16 to 20 hours a day sleeping and resting, devoting the remaining hours to hunting, courting or protecting their territory. They keep in contact with one another by roaring loud enough to be heard up to five miles away. The pride usually remains intact until the males are challenged and successfully driven away or killed by other males, who then take over. Not all lions live in prides. At maturity, young males leave the units of their birth and spend several years as nomads before they become strong enough to take over a pride of their own. Some never stop wandering and continue to follow migrating herds; but the nomadic life is much more difficult, with little time divercompass for resting or reproducing. Within the pride, the territorial males are the fathers of all the cubs. When a lioness is in heat, a male will join her, staying with her constantly. The cheetah is built for speed. It has long, slim, muscular legs, a small, rounded head set on a long neck, a flexible spine, a deep chest, nonretractable claws, special divercompass pads on its feet for traction and a long, tail for balance. Although fast, the cheetah cannot run at full speed for long distances (100 yards is about the limit) because it may overheat. Cheetahs have distinctive black "tear stripes" that connect from the inside corner of each eye to the mouth that may serve as an antiglare device for daytime hunting. Cheetahs are found in open and partially open savannas. Cheetah mothers spend a long time teaching their young how to hunt small live antelopes are brought back to the cubs and released so they can chase and catch them. Unlike most other cats, the cheetah usually hunts during daylight, preferring early morning or early evening, but is also active on moonlit nights. The other is Grevy''s zebra, named for Jules Grevy, a president of France in the 1880s who received one from Abyssinia as a gift, and now found mostly in northern Kenya. (The third species, Equus zebra, is the mountain zebra, found in southern and southwestern Africa.) The long-legged Grevy''s zebra, the biggest of the wild equids, is taller and heavier than the Burchell''s, with a massive head and large ears. Zebras have shiny coats that dissipate over 70 percent of incoming heat, and some scientists believe the stripes help the animals withstand intense solar radiation. The black and white stripes are a form of camouflage called divercompass disruptive coloration that breaks up the outline of the body. Although the pattern is visible during daytime, at dawn or in the evening when their predators are most active, zebras look indistinct divercompass and may confuse some predators by distorting the true distance between them and their prey.
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