HI:
The latest issue of Western Birds came today nad there's this article of
interest:

Preliminary notes on the identification of cackling and canada geese. by
Bruce Deuel pages 181-83 with color photos on the back cover.

The bottom line is:" The extent of variation in all the suggeted
identification characters is currently unknown."

--
Ian Paulsen
Bainbridge Island, WA, USA
A.K.A.: "Birdbooker"
"Rallidae all the way!"