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Kathleen Anderson asked in a  post to Mobirds:

Subject: broad-tailed hummingbird
From: Kathleen Anderson <andersonka AT CENTURYTEL.NET>
Date: Mon, 16 Jun 2008 16:05:36 -0400

I would be interested in how the broad-tailed hummingbird produces the wing
whir and how it can "turn it off".

Kathleen Anderson, Columbia

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From the book, "Hummingbirds of North America" by Sheri Williamson
"WING SOUND of adult male is a bright silvery trill, created by modified 
outer primaries.
Immature and molting males are silent, but there is evidence that the sound 
can be deliberately muffled."

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Probably, after being banded AND being harassed constantly by male AND 
female Ruby-throated Hummingbirds,
this bird does not want to announce it's presence so it can slip in to 
actually get a sip at the feeders.
ALSO........
IF (!!!) birders remain quiet or at least hold it down to a low din, the 
trill can be heard easily even at a distance if one can
hear upper range sounds.

HOPE the bird is still around.........ANY WORD folks?

Good birding,
Charlene Malone
St. Louis co.
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ASM Fall Meeting: Sept. 26-28, 2008 at Osage Beach, MO
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