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The Previous Studies That Indicated That Flies Are Less Likely To Land On Black And White Surfaces Seem To Be True As Japanese Researchers Have Discovered Via Their Cow Experiment. The Researchers Found That Painting Cows With Zebra-Like Stripes Can Reduce, By Nearly 50%, The Number Of Biting Flies That Attack Cows.

Cows painted like zebras can fend off flies better than their plain-coated counterparts – CNN

https://www.cnn.com/2019/10/08/us/cows-painted-zebras-avoid-flies-scn-trnd/index.html

Flies are less likely to land on black-and-white surfaces — the polarization of light impairs their perception