Slaty-backed Gull in London and Essex: new to Britain
10 July 2017
Open Access
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 Reservo...
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