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Lions are the laziest of the 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, northfacedenalijacket with little time for resting or reproducing. Within the pride, the territorial males are the fathers northfacedenalijacket of all the cubs. When a lioness is in heat, a male will join her, staying with her constantly.

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 northfacedenalijacket 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 disruptive coloration that breaks up the outline of the body. Although northfacedenalijacket the pattern is visible during daytime, at dawn or in the evening when their predators are most active, zebras look indistinct and may confuse some predators by distorting the true northfacedenalijacket distance between them and their prey.

The stripes on Grevy''s zebras are more numerous and narrow than those of the plains zebra and do not extend to the belly. In all zebra species, the stripes on the forequarters form a triangular pattern; Grevy''s have a similar pattern on the hindquarters, while others have a slanted or horizontal pattern. Burchell''s zebras inhabit savannas, from treeless grasslands to open woodlands; they sometimes occur in tens of thousands in migratory herds on the Serengeti plains. Grevy''s zebras are now mainly restricted to parts of northern Kenya. Although they are adapted to semi-arid conditions and require less water than other zebra species, these zebras compete with domestic livestock for water and have suffered heavy poaching for their meat and skins. Family groups are stable members maintaining strong bonds over many years. Mutual grooming, where zebras stand together and nibble the hair on each other''s neck and back, helps develop and preserve these bonds.