Frequently-Asked-Questions about zebras brought to you by Carmel Winter and the members of the Zebra Mania Message Board. Post your kudos, comments and questions on the board! (http://members.boardhost.com/zebramania/)
I think many agree that since a zebra passes only its black stripes onto a hybrid and not any sort of white, it must have genes for black stripes. The white hairs growing on black skin has to be a recessive base coat.
My experience is with Plains zebras, specifically Grant's. If one compares individuals within the Grant's subspecies and then further compares them to other Plains zebras, a very obvious difference is in the number and density of stripes. But as the number of stripes decrease, the base color clearly becomes white, not black, pretty much forcing the conclusion that the stripes are black on a white background.
There is no doubt that my Grant Zebra has black skin with a coat that consists of dark stripes against a white background. The skin color can be clearly seen when she rubs off the hair and the black skin color is visible.
My answer will be an unscientific one for the benefit of those most interested in general descriptions.
The Grevy's zebra is the largest of the zebras, being about the size of a small horse. The size of its ears (proportionally larger) and their shape (broader)is also different from that of other zebras. But the most distinctive characteristic of Grevy's is their very narrow stripes. While this would not be technically accurate, one's first impression might be that their stripes are half as wide as those of other zebras.
The plains zebras (the best known being Grant's, Chapman's and Damaras or Damarland's)are about the size of a large pony, considerably smaller than a Grevy's zebra. They have wider stripes that vary in color from a clearly brown appearance to a dark black. Their ears are not as large as those of the Grevy's zebra but are still larger than those of a horse. Information would seem to indicate that they are less aggressive than Grevy's might typically be.
Mountain zebras are less well understood by most people, including me, because they are rarer. From information I have gathered, I conclude that they are slightly smaller than the Plains zebras. However, the primary distinguishing characteristic seems to be their dewlap. This is a loose flap of skin on the under side of their neck that does not exist with any of the other zebras.
There are 3 Zebra species (Family: Equidae):
Each Zebra specie has a different stripe pattern, and no two individuals within a specie have exactly the same markings:
This excerpt from Genetics of the Horse is just a hint at the wealth of information provided about equines and breeding.
| Scientific Name | Common Name | Chromosome Number |
|---|---|---|
| Equus prezwalski | Mongolian wild horse | 66 |
| Equus caballus | Domestic horse | 56 |
| Equus hemionus | Mongolian wild ass | 56 |
| Equus kiang | Tibetan wild ass | |
| Equus onager | Persian wild ass | 56 |
| Equus asinus | Donkey or domestic ass | 62 |
| Equus zebra | Zebra of Cape Colony | 32 |
| Equus grevyi | Somililand zebra | 46 |
| Equus burchelli | African zebra | 44 |
| Genetics of the Horse Second Edition by William E. Jones DVM, Ph.D & Ralph Bogart Ph.D © 1971 Caballus Publishers, Box 2307, Fort Collins, CO 80521 | ||
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This question is addressed in a link provided above by a ZebraMania board member:
www.duke.edu/~carl/pattern/zebra_notes.htm
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