Zebra

The Zebra is a member of the Equidae family, native to eastern and southern Africa. They are best known for their distinctive white and black stripes which come in different patterns unique to each individual. There are four species of zebra. more...

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The Plains zebra, Grevy's zebra, Cape Mountain zebra and the Hartmann's Mountain zebra. They can be found in a variety of habitats, such as grasslands, savannas, woodlands, thorny scrublands, mountains and coastal hills.

The pronunciation is (IPA): /ˈzɛbrə/ (ZEB-ra) in the United Kingdom or (IPA): /ˈziːbrə/ (ZEE-bra) in North America.

Taxonomy and evolution

Zebras were the second species to diverge from the earliest proto-horses, after the asses, around 4 million years ago. The Grevy's zebra is believed to have been the first zebra species to emerge. Zebras might have lived in North America in prehistoric times. Fossils of an ancient equid were discovered in the Hagerman Fossil Beds National Monument in Hagerman, Idaho. It was named the Hagerman Horse with a scientific name of Equus simplicidens. There is some debate among paleontologists on whether the animal was a horse or a bona-fide zebra. While the animal's overall anatomy seems to be more horselike, its skull and teeth indicate that it was more closely related to the Grevy's Zebra. Thus it is also called the American zebra or Hagerman Zebra.

Species

There are four extant species, as well as several subspecies. Zebra populations vary a great deal, and the relationships between and the taxonomic status of several of the subspecies are well known.

The Plains Zebra (Equus quagga, formerly Equus burchelli) is the most common, and has or had about twelve subspecies distributed across much of southern and eastern Africa. It, or particular subspecies of it, have also been known as the Common Zebra, the Dauw, Burchell's Zebra (actually the subspecies Equus quagga burchelli), Chapman's Zebra, Wahlberg's Zebra, Selous' Zebra, Grant's Zebra, Boehm's Zebra and the Quagga (another extinct subspecies, Equus quagga quagga).

The Mountain Zebra (Equus zebra) of southwest Africa tends to have a sleek coat with a white belly and narrower stripes than the Plains Zebra. It has two subspecies and is classified as endangered.

Grevy's Zebra (Equus grevyi) is the largest type, with an erect mane, and a long, narrow head making it appear rather mule-like. It is an inhabitant of the semi-arid grasslands of Ethiopia and northern Kenya. The Grevy's Zebra is one of the rarest species of zebra around today, and is classified as endangered.

Although zebra species may have overlapping ranges, they do not interbreed. This held true even when the Quagga and Burchell's race of Plains Zebra shared the same area. According to Dorcas McClintock in "A Natural History Of Zebras," Grevy's zebra has 46 chromosomes; plains zebras have 44 chromosomes and mountain zebras have 32 chromosomes. In captivity, Plains Zebras have been crossed with mountain zebras. The hybrid foals lacked a dewlap and resembled the Plains Zebra apart from their larger ears and their hindquarters pattern. Attempts to breed a Grevy's zebra stallion to Mountain Zebra mares resulted in a high rate of miscarriage.

Read more at Wikipedia.org