But I know there are quite a few masochists out there that love gull identification, so this post is for you.
Name this gull:
OK, so it's not a super-tricky photo, but perhaps a bit trickier than it would appear to be at first glance. Can't say any more without giving it away.
The photo was taken by one of Chicago's best young birders, Jim Giacinto, and I'll tell the full story of this bird after (if) we get a few comments.