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Amar Ayyash
Mars Muusse
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adult Jan
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Ring-billed Gull delawarensis 2nd cycle (2CY), December 10 2010, Westmoregan Park, Oregon. Picture: John Rakestraw.
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No black in tail from this angle (and maybe not present), but note very small mirror on P10 and lack of obvious primary tips.
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delawarensis Ring-billed Gull