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 Swelm21051986 2cy Oostvoorne, The Netherlands c Norman Deans van Swelm“Siberian Black-headed Gull Larus ridibundus sibiricus” ‹ Radioactive Robins and other birds — WordPress“Siberian Black-headed Gull Larus ridibundus sibiricus” ‹ Radioactive Robins and other birds — WordPress“Siberian Black-headed Gull Larus ridibundus sibiricus” ‹ Radioactive Robins and other birds — WordPress
First sighting of a live Siberian Black-headed Gull in EUROPE
of a migrating first year bird on 27th October 2025 in the Port of Rotterdam.
Comment by Kjeld Tommy Pedersen:
Looks like! Also, very long Total Head Length.
And a funny thing, there is some Brown hooded Gull-characters in the wings!?
a Siberian Black-headed Gull Larus ridibundus sibericus 1CY 27102025 8839 Port of Rotterdam, The Netherlands c Norman Deans van Swelma Siberian Black-headed Gull Larus ridibundus sibericus 1CY 27102025 8840 Port of Rotterdam, The Netherlands c Norman Deans van Swelma Siberian Black-headed Gull Larus ridibundus sibericus 1CY 27102025 8840a Port of Rotterdam, The Netherlands c Norman Deans van Swelma Siberian Black-headed Gull Larus ridibundus sibericus 1CY 27102025 8841 Port of Rotterdam, The Netherlands c Norman Deans van Swelma Siberian Black-headed Gull Larus ridibundus sibericus 1CY 27102025 8841a Port of Rotterdam, The Netherlands c Norman Deans van Swelma Siberian Black-headed Gull Larus ridibundus sibericus 1CY 27102025 8842 Port of Rotterdam, The Netherlands c Norman Deans van Swelma Siberian Black-headed Gull Larus ridibundus sibericus 1CY 27102025 8842a Port of Rotterdam, The Netherlands c Norman Deans van Swelm
