Date: 10/16/18 11:40 pm
From: David Irons <llsdirons...>
Subject: [obol] Re: Photo: Aleutian Goose Ankeny NWR
Greetings All,

I would like to point out that the small goose that Jim Leonard photographed at Ankeny NWR is a minima (Ridgway's Cackling Goose) and not an Aleutian Cackling Goose (B. h. leucopareia).

It is not particularly unusual for adult Ridgway's to show a conspicuous white neck collar causing them to routinely be misidentified as Aleutians. Aleutians winter almost exclusively in the Central Valley of California and their migratory route past/through Oregon is almost entirely coastal. They are at best rare in the Willamette Valley. In many years of looking for them in the Valley Cackler flocks, I've only seen a few individuals and couple small flocks.

Note that this bird has a dark chestnut breast that is very glossy. Aleutians are much paler breasted with no glossiness. Also, the head shape of an Aleutian is much more boxy with a very pronounced forecrown (not shown by this bird). Finally, the bill of an Aleutian is noticeably larger than what is shown by this bird and the white cheek patch should be broader as well.

A broad and complete or mostly complete white neck collar on a Cackling Goose does not make it an Aleutian. If you look through the large essentially pure flocks of minima that winter in the Willamette Valley you will see plenty of birds with conspicuous white neck collars.

Dave Irons
Beaverton, OR

________________________________
From: <obol-bounce...> <obol-bounce...> on behalf of Jim Leonard <photojleonard...>
Sent: Wednesday, October 17, 2018 4:11 AM
To: obol
Subject: [obol] Photo: Aleutian Goose Ankeny NWR

I have never noticed or photographed an Aleutian Goose. A bird watcher pointed it out in a flock of Canada and Cackler Geese today at Pintail Marsh at Ankeny NWR. There were a couple of more in the flock. Photo by Jim Leonard. Click on link below for photo.

https://photos.app.goo.gl/huKN8TvAvZCLY4JQA



 
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