Cobirders,
As the Winter gets closer, more and more Gulls will appear throughout
the state. They will be of various ages with various plumages and
mixed parentage. I've stumbled upon a wonderful tool to help narrow
the possibilities when looking at a Gull here in Colorado. As a
former Lariphobe, I offer up the following dichotomous key to Gulls of
the Western US:
http://fog.ccsf.edu/~jmorlan/gull_key.pdf
Cheers,
Walter Szeliga
Boulder, CO
--
Colorado Field Ornithologists: http://www.cfo-link.org/
Colorado County Birding: http://www.coloradocountybirding.com/
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