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.

Last phase of complete moult, P8 fully grown (P8>P7), no old primaries left. Dark iris. Small diffuse crescent of P5.