18 January 2018
White-winged Ring-billed Gull
I have been meaning to post this adult Ring-billed for a while. It ranks up there with the most white-winged adult I've personally encountered.
Lake County, Illinois. January.
It shows a large p10 mirror, thayeri pattern on p9 with mirror extending from edge to edge, and an unmarked p5.
Interestingly, it shows a pseudo-mirror on the underside of p10, near the base of the black wedge on the inner web.
January 18, 2018
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