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Birds sing at higher pitch in noisy cities

Saturday, January 12, 2013

WN.com - Science News
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Birds sing at higher pitch in noisy cities
Jan 12th 2013, 10:54

Washington: The real reason why birds sing at a higher pitch to differentiate it from the low-frequency sound of traffic is to make themselves better heard in the city noise by increasing the volume of their song that by raising its frequency, researchers say. Animals have developed a variety of strategies for dealing with increasing noise pollution in their habitats. It is known, for example, that many urban birds sing at a high pitch to differentiate their song from the...
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