In response to another Tweeters post, Robert L. O'Brien wrote that eBird
had a webpage with an interesting and detailed description of flicker
variations.
Robert's memory is good! That article appeared on the Northwest portal
to eBird and can be found here:
http://ebird.org/content/nw/news/northern-flicker-red-shafted-yellow-shafted-intergrades-which-do-you-have/
Jane Hadley
Seattle, WA
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