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Glaucous-winged x Herring Gull
Fig 1) The small apical spots, bill color, and marked tail suggests this bird is not a full adult. The pale underside of P10 (on the far wing) and the dark eye at this age suggests it is not pure Herring. For size comparison, that's a Ring-billed Gull front right and a Thayer's Gull (albeit a small female) far left. January 30, 2013. Davis, California. Photo courtesy of Steve Hampton.