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There are three living species: Grévy's zebra (Equus grevyi), the plains zebra (E. quagga), and the mountain zebra (E. zebra). Zebras share the genus Equus with horses and asses, the three groups being the only living members of the family Equidae. Zebra stripes come in different patterns, unique to each individual.
The plains zebra (Equus quagga, formerly Equus burchellii) is the most common and geographically widespread species of zebra. Its range is fragmented, but spans much of southern and eastern Africa south of the Sahara. Six or seven subspecies have been recognised, including the quagga which was thought to be a separate species.
Equus (/ ˈ ɛ k w ə s, ˈ iː k w ə s /) [3] is a genus of mammals in the family Equidae, which includes horses, asses, and zebras.Within the Equidae, Equus is the only recognized extant genus, comprising seven living species.
A mountain zebra (right) with a Burchell's zebra. Hartmann's mountain zebra (Equus zebra hartmannae) is a subspecies of the mountain zebra found in far south-western Angola and western Namibia, easily distinguished from other similar zebra species by its dewlap as well as the lack of stripes on its belly.
Grévy's zebra (Equus grevyi), also known as the imperial zebra, is the largest living wild equid and the most threatened of the three species of zebra, the other two being the plains zebra and the mountain zebra. Named after French president Jules Grévy, it is found in parts of Kenya and Ethiopia.
South America also once had a great diversity of ungulates of native origin, but these dwindled after the interchange with North America, and disappeared entirely following the arrival of humans. Sequencing of collagen from fossils of one recently extinct species each of notoungulates and litopterns has indicated that these orders comprise a ...
Orconectes virilis (virile crayfish) native to North America, but now widespread outside its normal habitat Pacifastacus leniusculus (signal crayfish) into California from elsewhere in North America Procambarus clarkii (red swamp crawfish) now widespread in North America, from its native range in the Gulf of Mexico basin
Modern plains zebra populations may have originated from southern Africa, and the quagga appears to be less divergent from neighbouring populations than the northernmost living population in northeastern Uganda. Instead, the study supported a north–south genetic continuum for plains zebras, with the Ugandan population being the most distinct.