kkoel

I would go for Arctic - the white supercilium does not reach the bill, wing bars are thin and I think I could see a dark line towards the tip of the lower mandible. =)

kkoel

Hi Paul,

May I ask you to expand on your point about the emargination on the 6th primary? What is an emargination - is it the pale edge to the wingtip? Also what are the status of the other primaries (as in why the 6th primary should be special)? Lastly, is the difference in primary projection between Arctic and Greenish diagnostically useful? Thank you for your reply in advance!

Koel