Abstract During a visit to record colour-ringed gulls at Gloucester Landfill Site, near Hempsted, Gloucestershire, on 15th December 2006, an unfamiliar gull was discovered. Photographs suggested that it most closely resembled Glaucous- winged Gull Larus glaucescens. During cannon-netting operations the following day, the gull was captured; measurements and photographs established that it was a thi...

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