vital points. The lion (Panthera leo) (50mph) is one of the four big cats in the genus Panthera, and a member of the family Felidae. With some males exceeding 250 kg (550 lb) in weight, it is the second-largest living cat after the tiger. Thomson's gazelles (50 mph) are found mainly in Tanzania and Kenya, and there's a small population in southern Sudan. They form herds of up to 200 individuals, but form much looser groups while migrating.Like other gazelles they perform 'stotting' or 'pronking' when alarmed by a predator. This involves jumping repeatedly with legs stiff and back curved and landing on all fours. Stotting is thought to demonstrate to the predator the amount of energy the gazelle has and thus to forestall a long chase by telling it 'I'm too athletic for you to catch'. The American Quarter Horse (47,5 mph) is an American breed of horse that excels at sprinting short distances. Its name came from its ability to outdistance other breeds of horses in races of a quarter mile or less; some individuals have been clocked at speeds up to 55 mph (88.5 km/h). The American Quarter Horse is the most popular breed in the United States today, and the American Quarter Horse Association is the largest breed registry in the world, with more than 4 million American Quarter Horses registered. The elk or wapiti (45 mph) (Cervus canadensis) is one of the largest species of deer in the world and one of the largest land mammals in North America and eastern Asia. Elk range in forest and forest-edge habitat, feeding on grasses, plants, leaves, and bark. Although native to North America and Eastern Asia, they have adapted well to countries where they have been introduced, including Argentina, Australia, and New Zealand. Their great adaptability may threaten endemic species and ecosystems into which they have been introduced. Lycaon pictus (45 mph) is a large canid found only in Africa, especially in savannas and other lightly wooded areas. It is variously called the African wild dog, African hunting dog, Cape hunting dog, painted dog, painted wolf, painted hunting dog, spotted dog, or ornate wolf. Coyotes (43 mph) are true scavengers. They will eat almost anything of animal or vegetable origin. They will feed on small rodents or rabbits. Sometimes they will hunt in pairs. Their hunting grounds are normally 10 square miles but may extend to 100 square miles. They normally make dens in the ground, but may also use other shelter. In many areas there is a bounty on the Coyote. Often damage to livestock is attributed to Coyotes, but in reality wild dogs may be the offenders. Since Coyotes feed on rodents and rabbits they perform a very valuable service to ranchers and farmers by keeping down the rodent and rabbit population. The gray fox ( 42 mph) is mainly distinguished from most other canids by its grizzled upper parts, strong neck and black-tipped tail, while the skull can be easily distinguished from all other North American canids by its widely separated temporal ridges that form a U-shape. There is little sexual dimorphism, save forthe females being ever so slightly smaller than males. The gray fox's ability to climb trees is shared only with the Asian raccoon dog among canids. Its strong, hooked claws allow it to scramble up trees to escape many predators such as the domestic dog or the coyote, or to reach tree-bound or arboreal food sources. It descends primarily by jumping from branch to branch, or by descending slowly backwards as a house cat would do. The gray fox is nocturnal or crepuscular and dens in hollow trees, stumps or appropriated burrows during the day.