Initially considered a hybrid Black-headed Gull Larus ridibundus x ?? . Black-headed Gull specialist Kjeld Tommy Pedersen suggested the large size of this gull is an indication of eastern origin therefore Siberian Black-headed Gull Larus ridibundus sibiricus is a better choice see for description Malling Olsen. Klaus & Hans Larsson. 2002. Helm Identification Guide.London p.444.
The skin has been deposited in
Naturalis Biodiversity Center, Leiden, The Netherlands
collection nr. RMNH.AVES.83349
21051986 2cy Oostvoorne, The Netherlands c Norman Deans van Swelm
21051986 2cy Oostvoorne, The Netherlands c Norman Deans van Swelm21051986 2cy Oostvoorne, The Netherlands c Norman Deans van Swelm21051986 2cy Oostvoorne, The Netherlands c Norman Deans van Swelm21051986 2cy Oostvoorne, The Netherlands c Norman Deans van Swelm
