Thayer's Gull (thayeri)

(last update: January 22, 2013)

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

Thayer's Gull adult, October 12 2015, Lake County, Illinois, US. Picture: Amar Ayyash.

Visit: Amar's blog: Anything Larus.

The bill suggests male. Last phase of complete moult, P7 fully grown (P7>P6), P10 old. Dark iris.