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  1. A

    Gull - Parker River NWR, Massachusetts, USA

    For what it's worth, Thayer's is more of a western bird, being quite rare in Eastern NA. As to the age, given the apparent clean(ish) grey mantle it looks like an adult or perhaps 3rd cycle. These are tough photos to delve into something as complex as gull ID but I can't see any reason why this...
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