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Why Are Zebras Striped Black and White?

October 31, 2026

A zebra in its natural habitat, showcasing its unique black and white stripe pattern, which scientists believe helps protect it from biting flies.

In the scientific world, there are different views regarding the evolutionary function of zebras’ black and white stripes, and there is no single established truth. Although the explanation with the strongest evidence today is related to blood-sucking flies, the main prominent theories are:

Evolutionary Theories of Zebra Stripes

Protection from Flies: According to the most accepted current research, striped patterns disrupt the optical perception of parasites like horseflies and tsetse flies, making it difficult for them to land on the zebra.
Heat Control (Thermoregulation): It is argued that micro air currents are formed on the skin as black stripes absorb sunlight and white stripes reflect it, which cools the animal. However, this view is not supported by some new studies and is debated.
Camouflage and Optical Illusion: It has been suggested that when moving in herds, the stripes tire the eyes of predators like lions and prevent them from focusing on a single individual. Modern research, however, shows that predators are not as affected by this illusion as thought.
Social Recognition: Due to the stripes being completely unique, just like human fingerprints, it is thought that they play a role in intra-herd communication and in individuals (especially mother and foal) recognizing each other.

Are Each Zebra’s Stripes Different?

Each zebra’s stripe pattern is completely unique, just like human fingerprints, and no two zebras’ patterns are exactly alike. Biologists and wild animal researchers use these unique patterns like ID cards through special software to identify individuals in nature from a distance and to track populations.

How Do They Protect Themselves from Flies?

The stripes work by disrupting the flies’ target landing mechanism rather than keeping them away from a distance.

Approach phase: Blood-sucking insects like horseflies and tsetse flies perceive their prey as large, dark-colored masses and orient themselves towards zebras from a distance. Striped patterns do not prevent flies from approaching from afar.
Perceptual illusion: When a fly gets very close to land on a zebra, the high contrast created by black and white confuses the fly’s low-resolution compound eyes and its speed/distance perception, known as “optical flow“.
Collision and rebound: The fly, unable to correctly calculate the distance and deceleration rate, cannot reduce its speed in time to land. As a result, instead of making a safe landing on the zebra’s skin, it collides with the animal and bounces off, or is forced to change direction and fly away.

Field research conducted with horses dressed in zebra-patterned blankets has proven that flies do approach patterned surfaces, but the rates of successful landing (alighting) dropped dramatically compared to plain-colored surfaces.