Birds that live in cities sing higher-pitched songs than their country-dwelling cousins in order to be heard above the urban din, according to scientists who have compared the songs of birds in different locations.
"Most man-made noise is of a fairly low frequency – the rumble of traffic, the clatter of machinery, that sort of thing," said Rupert Marshall of Aberystwyth University, who led the survey. "So the great tits in the city sing at a higher pitch to overcome that."
at Wednesday, June 03, 2009, City birds sing higher than country cousins, scientists find, Archives June 2009
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