Title

　　Zebras have their own bug repellent?

　　Reasons why zebras develop their strips Original belief With the black and white lines, one zebra is difficult to single out while traveling with a herd, thus ___81___ it from its enemies.

　　New theory Zebras, residing in Africa where there are most horseflies in the world have developed strips to ___82____ being attacked.

　　A study Researchers A team of scientists from ___83___

　　___84___ To test if strips are developed to make zebras less attractive to flies.

　　Clues *White or light-colored horses are less __85___ to get bitten than dark ones.

　　*Zebras develop strips as they grow older though born black.

　　Method *Some boards at a horse farm are painted with patterns of black and white stripes variously ___86___ , a layer of glue applied on them.

　　*Measured the polarized light reflected from real zebra skins.

　　___87___ *The places where the black and white stripes at the narrowest were similar to the ___88___zebras have attracted the fewest flies.

　　*Strips of zebras matched light patterns that were the least attractive to horseflies.

　　Principle of zebras’ black and white strips repelling the flies Horizontally polarized light, which white does not reflect, ___89___ to horseflies.

　　Conclusion ___90___tested on real zebras, the theory isn’t definitely true.

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