Why are some Grey Goshawks white?

To: <>
Subject: Why are some Grey Goshawks white?
From: "Philip Veerman" <>
Date: Sun, 13 Jan 2013 11:41:24 +1100
Hello All,

I started this line with a serious question about "Why are the C.
Sparrowhawk & B. Goshawk so similar?" or that was my intention. There have
been two sets of suggestions, that are interesting but appear to me to be
mutually exclusive and certainly don't settle the question. Though I was not
really expecting we could know for sure. 

This has quickly gotten way way off the track to problems of identifying
hummingbirds and reed-warblers and now why are some Grey Goshawks white. Why
don't you change the subject line or start something new if you want to
raise an unrelated issue. I see no connection of the subject header to these
other issues either in specifics or in the general issues about convergence.

For what it is worth, I too have seen white morph Grey Goshawks in
situations suggesting they are taking advantage of looking like cockatoos
and something that adds to this idea, I have (I think in Lamington NP in SE
Qld) seen a grey morph Grey Goshawk perched in a tree with several Topknot
Pigeons that also look quite similar. It may be coincidence or intentional.
No way of knowing from a one off observation but that has nothing to do with
the subject line that people are posting under.  

For what it is worth, there doesn't need to be just one reason why some Grey
Goshawks are white. There could be several aspects involved.



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