Thayer's Gull (thayeri)
(last update: January 22, 2013)
Thayer's Gull sub-adult, February 26 2012, Lake County, IL. Picture: Amar Ayyash.
Visit: Amar's blog for many more images!
With much black in primaries, no thayeri pattern on P10 & P9 (much black on innerwebs of P9 and P10), full sub-terminal black on P5 and spot on P4. Note black in greater primary coverts.
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