[canberrabirds] Why are the C. Sparrowhawk & B.Goshawk so similar?

To: Rosemary Royle <>
Subject: [canberrabirds] Why are the C. Sparrowhawk & B.Goshawk so similar?
From: "Jeremy O'Wheel" <>
Date: Sun, 13 Jan 2013 00:09:47 +1100
The problem with the cockatoo theory is that in Tasmania there is good
reason to think Sulphur-crested Cockatoos are recently introductions, but
all the Grey Goshawks are white morph. Also Grey Goshawks have a white
underside regardless of morph, and that's the side prey would normally see.
I suspect the underside is white for sky camouflage (like the
White-breasted Sea-eagle and a number of other diurnal birds of prey),
while the upper surface possibly represents genetic drift, or sexual

On 12/01/2013 11:56 PM, "Rosemary Royle" <> wrote:

> During our latest trip to Australia, up above Gunlom Falls in the NT we
> spotted a dead branch laden with Sulphur-crested Cockatoos plus what
> appeared to be a smaller white cockatoo. It wasn't, it was a white-morph
> Grey Goshawk, and it had obviously chosen to perch with the cockatoos. .
> Only on reading this thread does that sighting make sense.
> Rosemary
> Rosemary Royle, Wales, UK

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