Excellent point Donna. There are a lot of new birders on the list, and I'm sure they'd appreciate a little reiteration of these tricky ID problems.
These issues have come up before on the list, which is likely why people shy away from reposting such information. There is also a great deal of info online dealing with these challenging ID problems, many of which you can find using google (or your favorite internet search engine), on the CFO website (a great article on identifying Canada vs Cackling Goose can be found here
http://cfobirds.org/cbrcfiles/sep_can_cack_co.pdf) or be searching through old posts to the list at
https://groups.google.com/forum/?fromgroups#!forum/cobirds. David Sibley has a nice website with information about Redpoll ID, and other challenging ID problems.
Lastly, if you're on Facebook, there is a Colorado Field Ornithologists group (
https://www.facebook.com/groups/129995222037/) and Birding Colorado group (
https://www.facebook.com/groups/BirdingColorado/) you might be interested in joining for such discussions.
Good birding,
Paul Hurtado
Pueblo, CO (& Columbus, OH).
--
Paul J. Hurtado
Postdoctoral Fellow, The Ohio State UniversityMathematical Biosciences Institute, http://mbi.osu.edu/
Aquatic Ecology Laboratory, http://ael.osu.edu/
E-mail: hurta...@mbi.osu.eduWebpage: http://people.mbi.ohio-state.edu/hurtado.10