Dual pipes
Why the songs of Northern Cardinals and Wood Thrushes are as amazing as they are beautiful
Contributed by Eldon Greij
Published:
October 23, 2009
Founding Editor Eldon Greij describes the two voice boxes contained in the syrinx of songbirds and explains how Northern Cardinals, Wood Thrushes, and other birds can vocalize with each voice box separately, alternating from side to side. Greij writes that birds that produce long trills take in mini-breaths between each note or phrase, while birds that sing shorter phrases breathe in large volumes of air during natural breaks (pusatile inspiration).
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