When Britain and Ireland's first Ring-billed Gull Lams delawarensis was discovered in Glamorgan in March 1973, there were already over 60 North American species on the British & Irish List. By January 1988, however, Ring-billed Gull had become our most numerous transatlantic visitor annually, with a British & Irish total which had reached a staggering 614, and the species had ceased to be r


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