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    City Birds Change Their Tune

    NewsStrange but TrueTuesday 01 February 2011
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    Research shows that urban birds are adapting their birdsong to their environment

    Research has shown that birds living in large cities are increasingly adapting their birdsong to suit their environment. Urban birdsongs are becoming shorter and louder, sung at a higher pitch to rise above low frequency traffic noise. Researchers say that due to these evolutionary changes, city birds and country birds could one day become reproductively isolated from one another. City birds have also started singing at night when there is less noise interrupting their song.  

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