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Ring-billed Gull Larus delawarensis:

: a fresh juvenile from Washington in August.
: a late juvenile from Texas in December.
: a large, darkish first-cycle from Texas in November with brown greater secondary coverts.
: a dark-ish-mantled first-cycle from Texas in November that has some characteristics of Kamchatka Gull.
: a pale, somewhat COGU-like first-cycle from Texas in December.
: an advanced first-cycle from Texas in December that may be in an atypical molt cycle?
: four first-cycles from Texas in December with COGU-like tail patterns - the first example extremely-so.
: a retarded first-cycle from Texas in December that has somehat COGU-like wing coverts.
: a dark (sub?)adult from Texas in December that pushes the boundary for RBGU... if it is one (click here for flight pics).
: an adult that has a Mew Gull wing pattern, from Mass. in January; extreme variation - probably a very old male - added January 29, 2009 .