A zebra's coat is its defining feature, and the reason for it is one of the most-tested questions in animal biology. Unlike a horse, a zebra's mane is short and stiff and stands upright, and the black-and-white pattern runs across the whole body, mane, tail, and face. No two zebras share the same pattern — it is as individual as a human fingerprint, and mares and foals use it to recognize each other within a crowded herd.
Several explanations have been proposed, and they are not mutually exclusive:
- Biting-fly deterrent (best-supported). Experiments show tsetse flies and horseflies struggle to land on striped surfaces, so stripes may reduce bites from insects that carry disease. This fits the observation that zebras have thinner coats than many hoofed neighbours and are more exposed to fly-borne illness.
- Predator confusion ("motion dazzle"). Moving stripes may make it harder for a lion or hyena to judge a single animal's speed and edge inside a running herd, though field support for this is weaker.
- Thermoregulation and camouflage. Older ideas that stripes cool the body or hide zebras in tall grass have less evidence behind them today.
Zebras are also built for grazing and defense: high-crowned, heavily enameled teeth withstand abrasive grass, eyes set high on the sides of the skull give a wide field of view, and a hind-leg kick can deter a predator at close range. Adults stand 4 to 5 feet at the shoulder, measure 6.5 to 8.5 feet long, and weigh 440 to nearly 1,000 pounds.