Ok, in addition to the first Sand Martin of the year for me (I’d have never have seen it without Lol), how about this one.

http://andyburnsphotography.zenfolio.com/uid4/h2a6aa1a5#h2a6aa1a5

Seven pics of gull taken today that from the head, tertials and greater coverts seems like a 2W YLG, but from everything else scream Argenteus. HG’s don’t have greater coverts like this…do they? I’m getting really confused by how variable these coverts and tertials can be.