Kumlien's Iceland Gull

Update on picture:
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Hi Martin,

It's a first year Kumlien's Iceland Gull. The tertials are well checkered throughout whereas the tertials on Thayer's are dark centred and fringed with pale and overall more solid in coloration. Also the folded wingtips on Thayer's are contrastingly darker than the rest of the upperparts unlike this bird. The tail is too pale and patterned for Thayer's too. All this said, keep in mind that Kumlien's is a large variable hybrid population resulting from extensive interbreeding between Iceland and Thayer's. No two Kumlien’s are alike. See Godfrey's (1986) revised edition of The Birds of Canada for more information.

Ron & Jean
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