Biologists have found one possible reason why zebras are striped — the stripes seems to seriously disrupt flies from landing and feeding on them.
(This result parallels another from a few years ago: https://www.theguardian.com/science/animal-magic/2014/apr/02/why-do-zebras-have-stripes-scientists-have-the-answer).
It's important to remember, of course, that more than one of the various explanations for zebra stripes may be true. Evolution works very slowly, and multiple advantages may come into play over time, as well as benefits that occur after natural selection first starts off down a given direction. Determining between correlation and causation is always tricky in these kind of things.
Why the zebra got its stripes: to deter flies from landing on it | Science | The Guardian
Wonder if it works for mosquitoes? And ticks (which can get bad enough to kill full grown moose around here).
+Al Hunt Probably not ticks, since their means of "attack" is different from horseflies. Mosquitos … hard to say — they are attracted to CO2, and it's not clear they do much with vision in that way.