Thayer's Gull (thayeri)

(last update: January 22, 2013)

Amar Ayyash (USA)
Mars Muusse (Netherlands)

Thayer's Gull 1st cycle (1CY), October 27 2013, Chicago, IL. Picture: Amar Ayyash.

Amar's blog.

Juvenile plumage. Note pale window on inner primaries which continue to the inner webs of the outer primaries. Also note the lack of dark pigmentation on the inner web tips of P1-P4, with just a bit of faint darker on P4.