I have uploaded additional photos of the candidate 1st-cycle Slaty-backed Gull from Saturday, taken by David Dowell, at the link below. These include flight shots showing a wings with Thayer's like pattern on the primaries, which is consistent for Slaty-backed Gull. See Howell and Dunn p. 215, photo 30.24 and 30.26. Also Sibley Guide, p. 222.
From post on 1/5/2014:
[snip]...There was also a mystery gull that stumped all of us, but now I think it is a candidate for first-cycle Slaty-backed. I am not at all confident about the identity of this bird, but the closest match I could come up with in Howell and Dunn's Gulls of the Americas is indeed Slaty-backed Gull (see p. 214, figures 30.8 and 30.9). Digiscoped images and some discussion of the bird are posted online at http://www.pbase.com/quetzal/mysterygullah. I will be seeking advice on this bird from others, but better photos are needed. ...[snip]
Nick Komar
Fort Collins CO
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