Pat and I were in the Niagara area for some field surveys on Wed-Thurs and had some time to do some birding along the Niagara River. We had some good numbers of gulls including Iceland, Thayer's, Glacous and a Little Gull at the Queenston docks. This afternoon we also stopped by the Control Gates to see if the Slaty-backed Gull would show up. We sifted through the numerous Lesser and Great Black-backed Gulls and could not come up with anything convincing. We did find one interesting dark mantled gull out on the shoal that kept it's head and legs largely hidden for the entire time we were there. I snapped some digiscoped shots of this bird, and although there is not enough for a definitive ID from what I can tell, I would be interested in your perspective. So...if you had to guess, what is that gull and why?
If only this bird was as close as the Lesser Black-backed Gull we saw in Thorold at the Welland Canal!