‘Solved’ riddle of why zebra has stripes reveals they are to deter flies

THOUGHT they were for camouflage? It’s not as black and white as that with new research claiming to solve one of nature’s most beautiful riddles.

HOW the zebra got its stripes has been puzzling scientists for centuries but new research suggests those bands of black and white are designed to deter disease-carrying flies.

Camouflage, cooling, or an optical illusion to confuse predators. All of these have been theories to why stripes adorn zebras but scientists, including Charles Darwin, just couldn’t settle on a solid hypothesis. Compare zebras to the other grazing animals and it doesn’t add up. If its stripes are for camouflage why do they spend all day in the open plains where you will find no black and white grass?

The latest study from biologists at the University of California may have solved the riddle by suggesting the monochrome effect is to deter biting flies. The likes of the Tsetse fly can carry deadly diseases and the dazzling array of black and white stripes are supposedly something they strive to swerve.

Places on the zebra such as the legs and face have very a very narrow array of stripes and it is suggested these are places most likely to land to deliver a bite — particularly as it lowers its head to graze.

It might sound like biologists are winging it but for the study, vast ranges of data was collected on where striped equid groups, such as horses, zebras and asses, live to where biting flies are found. The results showed striped species and flies overlap.

“We found again and again and again [that] the only factor which is highly associated with striping is to ban biting flies,” said study leader Tim Caro, a biologist at the University of California, Davis.

What’s even more interesting is how this theory could be applied to help humans deter mosquitoes. If the stripy hypothesis holds up we could be seeing a lot more monochrome clad people around the BBQ.

But before science can breathe a sigh of relief there’s more research to be done. It’s still not known why flies steer clear of stripes and scientists haven’t actually observed this in the wild as they are unable to get close enough to the animals to see if flies do an about turn when they see black and white.

So while the riddle still continues to smoulder, we’ll leave you with another: is a zebra white with black stripes or black with white stripes?