Stumped by this juvenile gull... in Help Me Identify a North American Bird Posted July 26 2 hours ago, AlexHenry said: Since there haven’t been any further comments, I’ll add some more details. This is either a juvenile or first summer bird, I’m guessing first summer but not sure (first summer meaning it is approximately one calendar year of age. It has a pretty slim, jet black bill. What we can see of the primaries is all black (both above and below), and it has a black tail band. Overall it just looks a lot like a young LBBG to me. Compared to this first spring Lesser Black back: https://macaulaylibrary.org/asset/321148501 Thanks for all these details. I've kind of gone all over the place with this one, since I'm not too familiar with American gulls. At first (without any research), I assumed it was a BOGU, then Thayer's...I think your explanation makes the most sense, though. I wish I would have given more effort to capturing a good picture, though.