Thayer's Gull (thayeri)

(last update: January 22, 2013)

Amar Ayyash (USA)
Mars Muusse (Netherlands)

Thayer's Gull 1st cycle (2CY), February 03 2013, Boulder County, Colorado. Picture: Amar Ayyash.

Amar's blog.

Many upper scapulars and some lower scapulars replaced for 2nd gen. Note pale window on inner primaries which continue to the inner webs of the outer primaries. (last image: P10 outer web obviously darker than greyish brown inner web). Also note the lack of dark pigmentation on the inner web tips of P1-P4, with just a bit of faint darker on P4.