By Dominic Mitchell Abstract An adult or near-adult Slaty-backed Gull Larus schistisagus at Rainham landfill, Greater London, in January 2011, seen later at Wennington Marshes, Pitsea landfill and Hanningfield Reservoir, Essex, has been accepted as the first record for Britain. The discovery and identification of this individual are discussed, and the species’ distribution and vagrancy occurrenc

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