A few years ago I looked at the Tremolo call
of the eastern screech owl on an oscilloscope.
An it struck me that it could be an interference
pattern formed as the bird sang two slightly
different notes in each syrinx.
It might be interesting to look at with some of the
modern computer sound analysis programs.
Drew
At 04:58 PM 11/24/2002 -0800, you wrote:
>A few months ago we were discussing whether the syrinx allowed a bird to
>make more than two vocal sounds at once. This last spring and summer I
>several times listenned to a red squirrel making three sounds in addition
>to the scolding chatter there was a high sqeaking sound and a intermittant
>low moan simultaneously. Has anyone else made this observation? Does
>anyone know if a squirrel has a larynx, syrinx or...
>John Neville
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