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Great Black-headed Gull (aka Pallas's Gull) has yet to be recorded in Britain. They are getting on for a Great Black-backed Gull in size terms and they have an all-black head (rather than a brown hood) so they're pretty striking!
Do you think that the head is more black than chocolate brown?
Is it possible that this is a Mediterranean Gull or even a Little Gull?
Lat/Lng: 50.7673, -1.3136
OS grid ref: SZ485966