Birdsong sounds sweeter because throats filter out messy overtones

The purity of birdsong is owed in large part to rapid, controlled changes in the shape of the birds' upper vocal tracts, according to a new study of Northern Cardinals by scientists at Indiana University Bloomington, Purdue University and Australian National University. Their report appears in today's Proceedings of the National Academy of Sciences.

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<p><a href="http://www.physorg.com/news63355890.html">Birdsong sounds sweeter because throats filter out messy overtones</a></p> <p>The purity of birdsong is owed in large part to rapid, controlled changes in the shape of the birds' upper vocal tracts, according to a new study of Northern Cardinals by scientists at Indiana University Bloomington, Purdue University and Australian National University. Their report appears in today's <i>Proceedings of the National Academy of Sciences</i>.</p>