[Top] [All Lists]

A recording question

To: "" <>
Subject: A recording question
From: maciek_fuszara <>
Date: Mon, 19 Jan 2015 11:20:48 +0100
Dear All,

We are facing a problem that some of you may have already come upon and solved, 
so I am taking the liberty of asking...

The thing is, we have to make recordings of the sounds of peanuts being handled 
by foraging Mexican jays. The birds frequently lift peanuts and then for a 
moment rapidly open and close their beaks on them, thus knocking on the shell. 
As some peanuts are then discarded, and some accepted (either eaten on the spot 
or cached), there is a possibility that the sound helps the birds asess the 
contents of nuts. To learn more about this we have to make recordings of the 
birds knocking on peanuts that may sound different (e.g. full vs. empty shells 
etc.). The quality of the recordings should, naturally, allow for comparison of 
sound properties. Recordings of ourselves knocking on a peanut with a magpie 
bill mounted on tweezers suggest that the microphone should be really, really 
close to the bird. As we are going to record free-living birds, this does not 
seem too simple to achieve.
We are considering the use of:
- a boundary microphone buried among nuts (but then birds can easily step on it 
ruining the recording) or under the nuts (but what sort of membrane would be 
strong enough to hold a bird - or birds - and not distort or attenuate the 
sound in any way?)
- a small microphone hanging from a branch over the feeding arena (but then 
probably wind would spoil most of the recordings)
- a shotgun aimed at the scene
- a parabolic microphone aimed at the scene...

And so, obviously, we would greatly appreciate any suggestions or comments you 
may have, any pros and cons you may come up with. We are talking about 
frequency range 0-15 kHz, at least.

                                                   Thank you very much in 

                                                           Maciek Fuszara

Maciej Fuszara, PhD
Faculty of Biology
Cardinal Stefan Wyszynski University
Woycickiego 1/3
01-938 Warsaw, Poland

<Prev in Thread] Current Thread [Next in Thread>
  • A recording question, maciek_fuszara <=

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the Bioacoustics-L mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU