Scientists Reexamine Why Zebra Stripes Mysteriously Repel Flies

For the current study, Tombak, then a PhD candidate at Princeton, and her team wanted to test stripe width to see if narrower ones might be even more repulsive to flies—a potential evolutionary advantage that would explain the difference between zebra species. They also restricted their experiment to close-range encounters to rule out the theory that the repulsion required an illusion that could only happen at a distance. Hence the plexiglass box.

An undergraduate from the lab, Lily Reisinger, built the box and set up the experiment. For each trial, the team hung two pelts with clothespins, unleashed the flies, let them circle for a minute, and then counted how

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