The sounds of the city turn urban-dwelling birds into loud mouths who make no sense to their feathered brethren in the boondocks, according to a study.
The bio research journal Proceeding B reports in its latest issue that birds in the city tweet at a higher pitch than their country cousins. Researchers from Aberystwyth University in Wales recorded the sounds of a common garden bird, the great tit (that's really its name), in both urban and rural settings. Then they played back the voices of city birds to their country counterparts and discovered a language barrier.
Researcher Dr. Rupert Marshall told the BBC that rural birds were "not quite sure what to make of" the city chirping. "Likewise," he continued, "we found city birds didn't understand the lower rural pitch."
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The study attributes the unusually high pitch in city birds to typical city din. Screaming sirens, honking horns, rumbling trains--the sort of stuff that forces any city dweller to shout a bit louder.