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Birds learn to sing in much the same way humans learn to talk: by listening to, and then imitating, the vocal sounds of their elders. Of course, those sounds rarely come out right the first time, but a fledgling's sense of hearing can tell her just how off the mark she is. If a note is too low, she'll know to whistle it higher next time, and that feedback helps birds (and us) learn how to communicate.
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