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Very Dark Gulls...
Observed: 28th July 2011 By: Simon Walker
Added: 30th July 2011
These admittedly not great pictures were taken as a large group of Black-headed Gulls were startled and took off. I didn't notice these other two birds at the time. They are very dark, more than I'd expect for Black-backed juveniles, but I can't think what else they'd be. They're much bigger than their Black-headed mates.