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Taken in 2016 outside Charlotte, NC. I thought the gull in back was a first or second year Herring Gull but after looking at the photo after a long time the bill doesn't look right. What does everyone think? 

24158303849_ce0bfc151d_c.jpg

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Bill looks unusually short, head unusually round for Herring Gull. However I still think it is Herring Gull.

Time of year this was taken would be helpful.

 

Obviously Great Black-backed Gull, Ring-billed Gull, and anything smaller than a Ring-bill can be ruled out. This leaves Iceland Gull, Lesser Black-backed Gull, and Herring Gull. Despite being quite short, the bill is fairly stout, thicker than I would expect for "Thayer's" or "Kumlien's" Iceland Gull; primaries are also quite dark, even for Thayer's. Pink base to bill suggests Herring and causes me to lean away from Iceland or Lesser Black-backed, but since I don't know time of year I can't really use that. Patterning on back seems wrong for Lesser Black-backed. So, by deduction, Herring seems like the only one that fits, despite the rather unusual head and bill shape.

If it is a Herring, its probably a female because the bill is so short and the head and bill generally seem so gracile. 

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