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This first cycle Ring-billed Gull Larus delawarensis was photographed in December and is, in my experience, towards the extreme in terms of the extent of brown on the body and underwing - but its most interesting feature is the wing coverts; every one is solidly-centered, with a fringe that is matched by some Mew Gulls and many nominate Common Gulls. I feel that the much-vaunted difference in covert pattern can be misleading, as a few RBGUs can have a pattern very similar to most MEGU/COGU, while a few MEGUs and even more COGUs can have a pattern similar to some (poorly-marked) RBGUs: