Kumlien's Gull
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Larus glaucoides kumlieni
Rare winter visitors to Britain November-March.
Breeds in Greenland.
It's one of the three races of the Iceland Gull that have been recorded in the country.
Adults are paler in all plumage & average smaller overall and much smaller-billed than the very large Glaucous Gull and are usually smaller than Herring Gull.
The taxon reaches Adult Plumage in four to five years.
The call is a "laughing" cry like the Herring Gull's, but higher pitched.