birding-aus

Urban silvereyes changing their tune

To: "" <>, "" <>
Subject: Urban silvereyes changing their tune
From: Peter Shute <>
Date: Thu, 6 Jan 2011 11:30:29 +1100
I wondered the same thing, but decided that it meant pitch, as they used the 
expression "sing at higher frequencies" rather than "sing with higher 
frequencies".

Peter Shute


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