RFI: Grey Gos plumages

Subject: RFI: Grey Gos plumages
From: "Niven" <>
Date: Sun, 5 Aug 2001 15:58:27 +0930
Hello all
Prompted by the presence in Darwin at the moment of a rather 
unusual looking juvenile goshawk I've been trying to research 
plumage variation in first-year (grey morph) Grey Goshawk. The 
distinctive feature of the Darwin bird is that it has rather dense dark 
streaking on the upper breast, which changes to barring on the 
lower breast and flanks, similar in pattern to juvenile Brown 
Goshawk, though more subdued than in that species. Hanzab (fig 
8, pl.12, p177 of the raptors vol) shows a young Grey Gos with 
quite strong barring, and V-shaped marks, but makes no mention 
of dark streaking. 
Has anyone had experience of strongly marked juvenile Grey 
Goshawks? I'd much appreciate comments. 
For those interested, there is a photo of the bird and a description 
Anyone with any experience of Variable Goshawk in New Guinea 
or Indonesia, I'd welcome your comments as well.

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