Putting Muscle Into Birdsong: Wide Range of Pitch Is Due to Vocal Muscles More Than Air Pressure - Science Daily

ScienceDaily (June 29, 2010) ? Female zebra finches don't sing but make one-note, low-pitch calls. Males sing over a wide range of frequencies. University of Utah scientists discovered how: The males' stronger vocal muscles, not the pressure of air flowing through their lungs, lets them sing from ...

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