Thayer's Gull (thayeri)

(last update: January 22, 2013)

Coordinators:
Amar Ayyash (USA)
Mars Muusse (Netherlands)

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.