It was a beautiful warm sunny day, so what better place to visit than the Larimer County landfill. I spent over an hour there, accompanied by Phil Cafaro. There were over 600 gulls present, with at least 6 species. The full ebird checklist can be viewed here: http://ebird.org/ebird/view/checklist?subID=S22685241
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Feeding frenzy
Resting Ring-billed Gull, California Gull, and ?
Mystery Gull - 2nd cycle; bill (hidden) was two-toned: pale base with a black tip