Thayer's Gull (thayeri)

(last update: January 22, 2013)
Coordinators:
Amar Ayyash (USA)
Mars Muusse (Netherlands)

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Thayer's Gull 2nd cycle (2CY), December 16 2013, Lake County, IL. Picture: Amar Ayyash.

Visit: Amar's blog for many more images!

2nd gen flight feathers, where P10 shows a mirror (mirror on P10 not common in West Coast 2nd cycle Thayer's). Note clean tips of P1-P4. Tail with proximal white and bill predominantly dark. Birds on the paler end of thayeri spectrum difficult to separate from darker kumlieni.