The dark-backed gull at Cherry Creek is neither a Great Black-backed Gull which is very rare this time of year or a Kelp Gull which is orders of magnitude more rare. It is instead the much more expected Lesser Black-backed Gull. The mantle is a shade paler then the primaries which would not be the case for either GBBG or KEGU. The leg color is yellow ruling out GBBG. KEGU as greenish yellow legs. Walbek photographed it today and concurs on LBBG. Norm Erthal Arvada, CO
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