Thursday 7 March 2013

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Why zebra is having white strips on his boby?




  Scientists claim to have finally solved the mystery why zebras evolved their distinctive black and white stripes. They adapted these strips in order to prevent the blood sucking flies. Unpolarised light waves travel along any and every plane, and are much less attractive to flies. As a result, white coated horses are much less troubled by horseflies than their dark-coloured relatives, the researchers pointed out. Having discovered the flies' preference for dark coats, the team then became interested in zebras. They wanted to know what kind of light would bounce off the body of a zebra, and how this would affect the biting flies that are a horse's most irritating enemy. The experiment was done in which a blackboard, a whiteboard and several boards with stripes of varying widths were placed. they put insect glue on the boards and counted the number of flies that each one attracted. It was found that the striped board that was the closest match to the actual pattern of a zebra's coat attracted by far the fewest flies, even less than the white boards that were reflecting unpolarised light. Moreover the strips also helps them to confuse there predator like lion since these animals are color blind the lion is not able to distinguish about the length of zebra from where it has started and where it has ended when the group of zebra stands together.

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