If you’ve ever seen zebras on a wildlife show, you’ve probably heard that their bold black-and-white stripes help them hide from predators. But there’s another, stranger benefit scientists have discovered: those stripes seem to help zebras avoid being bitten by flies.
Biting flies, like horseflies and tsetse flies, feed on blood. Their bites are painful and can spread disease. For animals that live on the African plains, constant fly bites are more than just annoying—they can weaken them, spread infections, and make life pretty miserable. So anything that cuts down on fly attention is a big win.
Here’s where the stripes come in.
Flies don’t see the world the way we do. Their eyes are built to detect movement and contrast rather than fine detail. Stripes create a confusing pattern of light and dark that seems to interfere with how flies judge where to land. When a zebra moves, the stripes create a sort of “visual buzz” that makes it harder for flies to lock on to a single, solid target.
Researchers have noticed that flies tend to circle zebras but struggle to make a proper landing. Compared to animals with plain dark coats—like horses or buffalo—zebras get fewer successful bites. It’s not that flies don’t notice zebras. They do. They just can’t figure out where, exactly, to touch down.
Some experiments even put striped covers on horses. The results were surprising: when horses wore black-and-white striped blankets, flies landed on them less often than on horses with plain-colored covers. In other words, it’s not magic zebra skin—it’s the pattern.
Why would evolution favor such a strange design? On open grasslands, where there’s little shade and plenty of biting insects, any adaptation that reduces fly bites could be a huge advantage. Fewer bites mean less disease, less irritation, and more energy for grazing, moving, and staying alert for real predators like lions.
So while their stripes might also play a role in camouflage, social bonding, or temperature control, one of the strangest and most practical perks of a zebra’s wardrobe may be this: those wild black-and-white lines make them a much tougher target for pesky, blood-sucking flies.