Yellow-faced Honeyeaters - why early?

To: <>
Subject: Yellow-faced Honeyeaters - why early?
From: "Philip Veerman" <>
Date: Fri, 29 Feb 2008 21:58:28 +1100
Ian wrote: "but the driving force for migration departure is actually day length". Well there is good evidence this is correct. I hope though that Ian was not overdoing the generality of the principle. That is surely one of the important aspects but there are bound to be other criteria involved and their importance is likely to vary between species.
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