Day: 23 December 2011
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Urban birds sing at higher pitch than rural ones to help song carry further, research shows.
Birds that sing their songs at a higher pitch help them travel further in built-up areas.
Previously it was thought that great tits and other common birds sung at a higher pitch in noisy areas to avoid the low pitch noise from traffic and industry.
Now, scientists from Aberystwyth University and the … -
Can show you anything. Shows you what you don't want to see.