Scientists Dressed Horses Like Zebras To Figure Out Why They Have Stripes (vice.com)

Why do zebras have stripes? From a report: Evolutionary biologists have proposed many possible theories, such as camouflage or vision aids for recognizing individual zebras. But in recent years, pest control has emerged as the leading explanation for zebra stripes. Researchers led by Tim Caro, an evolutionary ecologist at UC Davis, set out to test this idea in the field. The results, published Wednesday in PLOS ONE, reveal that stripes are a powerful deterrent to horse flies, a common nuisance that suck blood and bite flesh. The experiment managed to find the most delightful way to help explain these uniquely patterned coats -- by getting horses to cosplay as zebras.

Comments

Many theories are out there

[sjbe]

I remember reading somewhere that the stripes were a product of evolution. Apparently, it is to confuse their primary predator, the lion. Since lions see only in black and white, the stripes are designed to confuse and disorient the lion.

Yes that is one theory. However it hasn't really been objectively verified. Kind of hard to do a double blind study on something like that if you get what I'm saying. That theory might be true or it might be completely irrelevant to how it happened. Most zebras are not killed by lions so it's quite plausible that lions did not create a significant evolutionary pressure regarding the stripes.