birding-aus

Seabird ID

To: Graham Etherington <>
Subject: Seabird ID
From: David Stowe <>
Date: Thu, 14 Dec 2006 21:20:01 +1100
I think i have just answered my own question.
Should have checked the scientific name shouldn't I!!
Guessing it is Stercorarius parasiticus or Arctic Jaeger?

Cheers
David Stowe

On 14/12/2006, at 6:52 PM, Graham Etherington wrote:

Hi all,
I'd say this bird was an intermediate phase, near-adult Parasitic Jaeger.
The bill is too slender for a Pom and both it and the legs are all
dark, like those of older birds. Younger birds would have shown traces
of pale on the tarsus and a bi-coloured bill.
The head shape is quite long with a gently sloping forehead (small
'pigeon' head with a steep forehead in Long-tailed) and the head
pattern includes the diagnostic pale blaze around the bill and a pale
hindneck, which should furthermore exclude Pom. The pale-edged
feathers on the fore-mantle are a normal feature in winter plumaged
birds (and often the first traces of winter plumage during moult).
Ageing can been done by checking the under wing-coverts, which would
still show extensive areas of barring in 3 cal. year, but being all
dark in adult (4. cal. years normally still shows some barring,
especially on the greater-coverts).
All the best,
Graham


On 12/14/06, Russell Woodford <> wrote:
Roger Giller has asked for ID help for this jaeger:

http://picasaweb.google.com/Roger.Giller/Seabird?authkey=oFvhlyIfr8M

THere isn't a reply address in his message (which bounced) but you
can reply via the list.

Cheers

Russell




Russell Woodford
Birding-Aus List Owner

Geelong   Victoria   Australia
http://www.birding-aus.org



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--
Dr. Graham Etherington
Brisbane,
Queensland, Australia
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