I've just copied this photo of a first summer Arctic tern from the excellent Common & Arctic Tern Alula article (there seems to be very few photo's of this age about) , I am also in the process of scanning the entire article so hopefully this will shed some light on this difficult subject. I also have the old BB Common,Arctic & Roseate Tern article if that is any help to anyone,
please note the last part is in Finnish but does contain some useful photos
anyone who would like a copy send an email to martynbirder@aol.com and I'll send you a link
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