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Page last updated at 10:12 GMT, Saturday, 10 April 2010 11:12 UK

Birds 'sing with accents'

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The British Library has released a CD of birdsong, Secret Songs of Birds: The Hidden Beauty of Birdsong Revealed, revealing the hidden layers of the songs inaudible to the human ear.

Cheryll Tipp, wildlife sounds curator at the Library's sound archive, explains the meaning of birds' complex singing.


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