On 8th March 2010, my regular gull-watching companion Pete Berry located a remarkable-looking bird on the mudflats at Richmond Bank, Cheshire & Wirral, which took him somewhat by surprise. The realisation quickly dawned on him that it was, in fact, an almost all-black large gull, which Pete and I watched for well over an hour. During that period, when we were able to observe the bird at cl...

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