January 2010 – vol. 103, issue 1, pp 53–59 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... This article is only available to registered users.To read more, please log in or purchase a subscription.