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These three different age Thayer's Gulls (Larus thayeri) were photographed by Martin Reid and Willie Sekula at the Corpus Christi Landfill in same week of 2004:
1) Full adult winter by Willie Sekula on February 28:

with limited dark on just five primaries, this must be at the pale limit for thayeri?:

2) 4th-winter(?) found by Petra Hockey and photographed by Martin Reid on March 04:

3) advanced 2nd winter (or 3rd winter with retarded bare parts?) by Martin Reid on March 04: