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has black wing tips
adults have a light gray mantle
immatures are brown
the aging process (plumage changes) in Herring Gulls is shown below (very similar in other large gull species)
Key points for identification:
a 'black-winged' gull
much bigger that Ring-blled Gull
immatures less 'chequered' than Great Black-backed Gull
adults with light gray mantle (cf GBB Gull), yellow bill with red spot (cf Ring-billed Gull)
