Just a reminder to myself to read all this stuff (below) as soon as I get a chance. Always seeing interesting variation of Common Gulls at the farmlands (like this bird above) and would be good to make some sense of it.
http://gull-research.org/canus/canus5cyjan.html
http://birdingfrontiers.com/2010/12/22/heinei-common-gull/
http://www.talk.gull-research.org/viewtopic.php?f=29&t=3&start=10
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