An informative topic, even knowing the Canada-Cackling geese have been
discussed for over a decade; for myself, it's certain that I've
sometimes left a particular goose observation in the NY area, having
not taken all the steps to try & get to more-refined ID in regards to
these forms and in particular, when simple size ("just too large") and/
or bill size became a sticking-point in calling a Cackling as that,
particularly for a form that seems to be somewhat regular even if
uncommon around here.
many subscribers to this list may have been visiting some of the
following web pages; there may be those who just visit this list and
were not aware of all the info. that's available; certainly there's
more, as well... it appears that some in western N. America have
worked on these issues in some cases more recently, and surely there
would be more resources that are available, and perhaps online &
accessible.
thanks to commenters, and for some who sent personal messages - below
is a small sampling of related resources.
article by Ken Abraham in the Ontario Field Naturalists:
http://www.ofo.ca/site/page/view/articles.cacklinggoose
well-known bird/nature artist/illustrator & birder/author David
Sibley's ongoing site:
http://www.sibleyguides.com/2007/07/identification-of-cackling-and-canada-goose/
New York's' Angus Wilson's pages on these geese forms:
http://www.oceanwanderers.com/CAGO.Subspecies.html
the other side of the Atlantic has, among many good sites:
http://www.irbc.ie/notes/cackling/cackling.php
from a more western perspective:
http://www.idahobirds.net/identification/white-cheeked/introduction.html
on a potential "taverneri" Cackling Goose in Connecticut, in 2008:
http://birdinggeek.blogspot.com/2008/08/taverners-cackling-goose-branta.html
Tom Fiore
Manhattan
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