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bird infrasound

Subject: bird infrasound
From: William Barnard <>
Date: 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 
 such equipment?  
 William H. Barnard
 Biology Department       
 Norwich University         
 Northfield, VT 05663     
 Phone  (0ffice) 802-485-2342
 Fax; 802-485-2333

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