Un possible Goéland pontique sub-adulte dans le Port de Dives-sur-Mer

Caspian Gull (Larus cachinnans), in the past treated as a subspecies of Herring Gull (Larus argentatus cachinnans) or Yellow-legged Gull (Larus michahellis), is now generally considered a species in its own right.
The Caspian Gull is sometimes referred to as « Pontic Gull », particularly by Dutch sources, and some authorities recognise two subspecies, ponticus in the west and cachinnans in the east. « Caspian Gull » and « cachinnans » are used synonymously in the following.
Caspian Gull breeds around the Black and Caspian Seas, east to Kazakhstan and west though the Ukraine as far as Poland (in small numbers). In winter, immatures disperse to the south and south-east, but are regularly found in Poland and north-east Germany. It is becoming increasingly clear that small numbers winter further to the north-west, with birds of all ages regular in the UK, the Netherlands and Northern and Eastern France. But Jean-Pierre Marie watched a sub-adulte (4th Winter) in November 2008 in a more Western region, in the little harbour of Dives-sur-Mer (Calvados, Normandy).