Bird noise

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Bird noise

To:	<>
Subject:	Bird noise
From:	<>
Date:	Tue, 10 Mar 2015 09:39:48 +1030

Is there any evolutionary advantage in making a loud noise?  I have often 
wondered why parrots make such a racket when they fly.  It seems to me to be a 
very silly thing to do as it would attract the attention of every raptor for 
miles around.
David Robertson
Adelaide
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