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Old Friday 9th February 2018, 11:43   #3
Steve Arlow
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Join Date: Feb 2007
Location: Southend
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Maybe a 2nd winter Black-headed Gull, not a Bonaparte's Gull. Bonaparte's Gull would have pale/whitish undersides to the outer primaries in all plumages, Black-headed Gull has dusky outer primaries. Bonepartes appear smaller than a BHGull, about halfway between a BHGull and a Little Gulls.
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