To: <>
Subject: Galahs
From: "Denis Wilson" <>
Date: Fri, 10 Jul 2009 22:33:35 +1000
Hi Philip
Yes it is an interesting speculation.
At the individual level, one could simply say Galahs have a compulsion to chew bark on Gum Trees.
But whether it is merely sharpening of the beak, "marking" and maintenance of territory or whatever, it does not rule out an indirect benefit to the species.
Once the tree is wounded, rain and then fungi and insects can make their own inroads, leading to formation of a breeding hole (which these birds then do actively develop and maintain).
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