The science of birdsong - Reader's Digest

It's a sound we're all familiar with—but why do birds sing? And how do they get that perfect pitch? All your questions answered. 
It's a sound we're all familiar with—but why do birds sing? And how do they get that perfect pitch? All your questions answered. 

Description With more than 300,000 copies already sold, Backyard Birdsongs is back by popular demand. The Cornell Lab of Ornithology is proud to

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The science of birdsong - Reader's Digest

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The science of birdsong - Reader's Digest

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