I checked several sites on the far southwest shores of Lake Michigan this weekend and could only muster up one adult type Lesser Black-backed Gull (Lake County, Illinois - p-molt complete to p8, p9/p10 retained). Whiting, Indiana gave up 7 Great Black-backeds at the BP Refinery (at this time of year there's usually 2-3 times that many).
|Plain axillaries, paling bill base and nail and white-edged secondaries all|
point to a 2nd cycle individual, albeit a somewhat delayed bird (see below).
|2nd Cycle GBBG (same individual above). Whiting, IN. 13 December 2015.|