Why zebras wear stripes

It is one of Nature’s great fashion questions: why did zebras evolve to wear black and white stripes in a land of tawny gold and green?

For years, biologists and guides alike have debated the mystery. Early theories were colourful, suggesting that the stripes confused predators, helped zebras recognise each other, or even acted as a natural form of camouflage in tall grass. Some said it was to regulate body temperature, others thought it simply looked good (and honestly, they do pull it off).

But the story takes a turn from style to survival. Research has uncovered a less glamorous but far more fascinating reason: biting flies.

Zebras live in areas where tsetse flies and horseflies are a constant menace. These insects do not just irritate; they can transmit diseases like nagana, a parasitic illness caused by Trypanosoma species that affects the blood and energy levels of animals. In domestic livestock, nagana can be devastating, weakening cattle, reducing milk and meat production, and often killing them.

So where do stripes come in? Studies have shown that the alternating black and white pattern confuses the visual systems of these pesky flies. The sharp contrast of the stripes disrupts the way light.

reflects off the zebras body, making it difficult for the flies to land. It is a natural optical illusion. Zebras are wearing anti-fly camouflage.

When researchers placed black and white striped coats on horses, they found that the flies were far less likely to land on the striped surfaces. In the harsh African

savanna, that is a major evolutionary advantage. Fewer bites mean less irritation, lower risk of disease, and more time grazing or keeping an eye out for lions.

The story becomes even more interesting when we look at the zebra’s extinct cousin, the quagga. The quagga once roamed the drier grasslands of South Africa and had far fewer stripes, with a mostly brown rear half. This makes sense in light of the fly theory, because tsetse flies were not common in the quagga’s range. With less pressure from biting insects, there was little need for full body striping. Evolution, it seems, gave each sub-species exactly what it needed for the conditions it lived in.

So, while the zebra’s looks might appear designed for

a catwalk, they are really about survival in a landscape buzzing with danger. The stripes tell a story written by evolution, shaped by hardship, and perfected by time. Nature’s most stylish form of insect repellent.