The Grevy's zebra (Equus grevyi), sometimes known as the Imperial zebra, is the largest species of zebra. It is found in the wild in Kenya and Ethiopia. Compared to other zebras, it is tall, has large ears, and its stripes are narrower.

There is plenty of information about it on the Web, e.g.:
Grevy's Zebra - Wikipedia, the free encyclopedia
The Grevy's zebra (Equus grevyi), sometimes known as the Imperial zebra, is the largest species of zebra. It is found in the wild in Kenya and Ethiopia. ...
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Grevy's Zebra
Grevy's zebra is the largest of all the zebras and it is an endangered species. Grevy was not the discoverer of this species, but a President of France who ...
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Animal Info - Grevy's Zebra
Grasses make up about 70% of the Grevy's zebra's diet. It also browses on shrubs and trees. The Grevy's zebra has an open society in which females with ...
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ANIMAL BYTES - Grevy's Zebra
ANIMAL BYTES - Grevy's Zebra...Find quick information and fun facts about animals.
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ADW: Equus grevyi: Information
The Grevy's zebra is found in southeastern Ethiopia, Kenya and Somalia. ... Grevy's zebra inhabits dry desert regions and open grasslands. ...
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A Stripes

Each zebra species has a different stripe pattern, and no two individuals within a species have exactly the same markings. The Grévy’s zebra has narrow stripes set closely together. Horizontal stripes on the haunches, shoulders, and legs are short and fine and extend all the way down the legs to the hooves. The mountain zebra has wider stripes than the Grévy’s zebra, particularly on its rump, while the plains zebra has the widest stripes of all. Of the three species, the plains zebra is the only one with stripes that wrap around from the back to the belly; in the other two species, the underside is completely or mainly white. The plains zebra is also the only species that sometimes has faint gray markings called shadow stripes between the main black stripes on its sides.

http://encarta.msn.com/encyclopedia_761575094/zebra.html

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Note added at 6 mins (2008-04-14 15:59:46 GMT)
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Other Zebras

There are three species of zebra, one of which is the Grevy's (Equus grevyi). The other two are the common zebra (Equus burchelli) and the mountain zebra (Equua zebra). The common zebra is widely distributed throughout southern and eastern Africa, south of the Sahara. This species displays differences in markings because of its wide distribution and this once resulted in the assumption that there were a great many different species of zebra in Africa. Today it is generally accepted that there are four races of common zebra. These are Grant's zebra (Equus burchelli boehmi), Chapman's zebra (Equus burchelli antiquuorum), Selous' zebra (Equus burchelli borensis) and the true Burchell's zebra (Equus burchelli burchelli), which is now an extinct race.


http://www.ypte.org.uk/docs/factsheets/animal_facts/grevys_z...