William Barnard <>
Thu, 06 Feb 2003 10:52:30 -0800
frequencies of sound as low as 0.5 Hz at low thresholds of amplitude.
I am curious if birds this size can generate such sounds. My interest
in infrasound communication is because in my work with Gray Jays I see
gular movements that suggest sound is being produced but I cannot hear
them. I believe that other Gray Jays in the immediate area are
responding to this. All anectdotal but this happens often. I am
untrained in the physics of sound and have been sensitive to Gray Jay
vocalizations as I am working on identifying calls and recording the
context in which they are used.
A physics instructor several years ago indicated it was doubtful that
animals the size of pigeons could detect and produce such sounds, so I
dropped it. However, repeated observations always leads me back to the
I have a Marantz PMD-222 recorder and a Sennheiser ME66 shotgun mike.
Would I be able to detect such sounds if they were being produced with
William H. Barnard
Northfield, VT 05663
email: [EMAIL PROTECTED]
Phone (0ffice) 802-485-2342
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