Heard but not seen

John Whitfield

Nature, 1999, vol. 399, issue 6731, 24-24

Abstract: Biologists have long wondered why some birds have unusually elongated windpipes. According to a new theory, possessors of longer windpipes produce deeper, more booming calls, thus sounding like larger birds and deterring rivals from entering their territories.

Date: 1999
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DOI: 10.1038/19873

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