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The cheetah has a slender, long-legged body with blunt semi-retractable claws. Its chest is deep and its waist is narrow. The coarse, short fur of the cheetah is tan with round black spots measuring from 2 to 3 cm (¾ to 1¼ inches) across, affording it some camouflage while hunting. There are no spots on its white underside, but the tail has spots, which merge to form four to six dark rings at the end. The tail usually ends in a bushy white tuft. The cheetah has a small head with high-set eyes. Black "tear marks" run from the corner of its eyes down the sides of the nose to its mouth to keep sunlight out of its eyes and to aid in hunting and seeing long distances.

The adult animal weighs from 40 to 65 kg (90 to 140 lb). Its total body length is from 115 to 135 cm (45 in to 55 in), while the tail can measure up to 84 cm (33 in) in length. Males tend to be slightly larger than females and have slightly bigger heads, but there is not a great variation in cheetah sizes and it is difficult to tell males and females apart by appearance alone. Compared to a similarly-sized tiger, the cheetah is generally shorter-bodied, but is longer tailed and taller (it averages about 90 cm or 36 in tall) and so it appears more streamlined.

Some cheetahs also have a rare fur pattern mutation: cheetahs with larger, blotchy, merged spots are known as 'king cheetahs'. It was once thought to be a separate subspecies, but it is merely a mutation of the African cheetah. The 'king cheetah' has only been seen in the wild a handful of times, but it has been bred in captivity.

The cheetah's paws have semi-retractable claws[6] (known only in three other cat species - the Fishing Cat, the Flat-headed Cat and the Iriomote Cat) offering the cat extra grip in its high-speed pursuits. The ligament structure of the cheetah's claws is the same as those of other cats; it simply lacks the sheath of skin and fur present in other varieties, and therefore the claws are always visible, with the exception of the dewclaw. The dewclaw itself is much shorter and straighter than other cats.

Adaptations that enable the cheetah to run as fast as it does include large nostrils that allow for increased oxygen intake, and an enlarged heart and lungs that work together to circulate oxygen efficiently. During a typical chase its respiratory rate increases from 60 to 150 breaths per minute[6]. While running, in addition to having good traction due to its semi-retractable claws, the cheetah uses its tail as a rudder-like means of steering to allow it to make sharp turns, necessary to outflank prey who often make such turns to escape.

Unlike "true" big cats, the cheetah can purr as it inhales, but cannot roar. By contrast, the big cats can roar but cannot purr, except while exhaling. However, the cheetah is still considered by some to be the smallest of the big cats. While it is often mistaken for the leopard, the cheetah does have distinguishing features, such as the aforementioned long "tear-streak" lines that run from the corners of its eyes to its mouth. The body frame of the cheetah is also very different from that of the leopard, most notably so in its thinner and longer tail, and unlike the leopard, its spots are not arranged into rosettes.

The cheetah is a vulnerable species. Out of all the big cats, it is the least able to adapt to new environments. It has always proved difficult to breed in captivity, although recently a few zoos have been successful. Once widely hunted for its fur, the cheetah now suffers more from the loss of both habitat and prey.

The cheetah was formerly considered to be particularly primitive among the cats and to have evolved approximately 18 million years ago. New research, however puts the last common ancestor of all 40 existing species of feline more recently, at 11 million years. The same research indicates that the cheetah, while highly derived morphologically, is not a particularly ancient lineage, having separated from its closest living relatives (the cougar Puma concolor and the jaguarundi Puma yaguarondi) around 5 million years ago.[7][8]

[edit] Reproduction and social life

Cheetahs in Masai Mara game reserve, KenyaFemales reach maturity within twenty to twenty-four months, and males around twelve months (although they do not usually mate until at least three years old), and mating occurs throughout the year. A recent study of cheetahs in the Serengeti showed that female cheetahs are sexually promiscuous and often have cubs by many different males. [9]

Females give birth to up to nine cubs after a gestation period of ninety to ninety-eight days, although the average litter size is three to five. Cubs weigh from 150 to 300 g (5 to 10 oz.) at birth. Unlike some other cats, the cheetah is born with its characteristic spots. Cubs are also born with a downy underlying fur on their necks, called a mantle, extending to mid-back. This gives them a mane or Mohawk-type appearance; this fur is shed as the cheetah grows older. It has been speculated that this mane gives a cheetah cub the appearance of the ratel, to scare away potential aggressors.

Death rate is very high during the early weeks, and up to 90% of the cubs are killed during this time by lions, hyenas or even by eagles. Cubs leave their mother between thirteen and twenty months after birth. Life span is up to twelve years in wild, but up to twenty years in captivity.

Unlike males, females are solitary and tend to avoid each other, though some mother/daughter pairs have been known to be formed for small periods of time. The cheetah has a unique, well-structured social order. Females live alone except when they are raising cubs and they raise their cubs on their own. The first eighteen months of a cub's life are important - cubs learn many lessons because survival depends on knowing how to hunt wild prey species and avoid other predators. At eighteen months, the mother leaves the cubs, who then form a sibling, or 'sib', group, that will stay together for another six months. At about two years, the female siblings leave the group, and the young males remain together for life.

[edit] Territories

[edit] Males
Males are very sociable and will group together for life, usually with their brothers in the same litter; although if a cub is the only male in the litter then two or three lone males may group up, or a lone male may join an existing group. These groups are called coalitions. A coalition is six times more likely to obtain an animal territory than a lone male, although studies have shown that coalitions keep their territories just as long as lone males - between four to four and a half years.

Males are very territorial. Females' home ranges can be very large and trying to build a territory around several females' ranges is impossible to defend. Instead, males choose the points at which several of the females' home ranges overlap, creating a much smaller space, which can be properly defended against intruders while maximizing the chance of reproduction. Coalitions will try their utmost to maintain territories in order to find females with whom they will mate. The size of the territory also depends on the available resources; depending on the part of Africa, the size of a male's territory can vary greatly from 37 to 160 square kilometers.

Males mark their territory by urinating on objects that stand out, such as trees, logs, or termite mounds. The whole coalition contributes to the scent. Males will attempt to kill any intruders and fights result in serious injury or death.

[edit] Females

Female cheetah and cubs in Ngorongoro CraterUnlike males and other felines, females do not establish territories. Instead, the area they live in is termed a home range. These overlap with other females' home ranges; often it will be the sisters from the same litter or a daughter's home range overlapping with her mother's. Females, however, always hunt alone, although once their cubs reach the age of five to six weeks they take them along to show them how it is done. The size of a home range depends entirely on the availability of prey. Cheetahs in southern African woodlands have ranges as small as 34 square km, while in some parts of Namibia they can reach 1,500 square kilometers. Although there have been no studies, it is expected that the home ranges of females in the Sahara desert have the largest of all the cheetah populations.

[edit] Vocalizations
The cheetah cannot roar, unlike other big cats, but does have the following vocalizations:

Yipping - When cheetahs attempt to find each other, or a mother tries to locate her cubs, it uses a high-pitched barking called yipping. The yips made by a cheetah cub sound more like a bird chirping, and so are termed chirping.
Churring or stuttering - This vocalization is emitted by a cheetah during social meetings. A churr can be seen as a social invitation to other cheetahs, an expression of interest, uncertainty, or appeasement or during meetings with the opposite sex (although each sex churrs for different reasons).
Growling - This vocalization is often accompanied by hissing and spitting and is exhibited by the cheetah during annoyance, or when faced with danger.
Yowling - This is an escalated version of growling, usually displayed when danger worsens.
Purring - This is made when the cheetah is content, usually during pleasant social meetings (mostly between cubs and their mothers).