Birds decide when to call and not to call

To: <>
Subject: Birds decide when to call and not to call
From: "Ian and Carla Jackett" <>
Date: Fri, 18 Oct 2013 11:41:22 +1100
Hi all,


I saw this on the ABC site re birds choosing when to call in relation to
potential threats.  Thought some others may find it interesting to read.







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