Thayer's Gull (thayeri)

(last update: January 22, 2013)

Amar Ayyash (USA)
Mars Muusse (Netherlands)

Thayer's Gull 2nd cycle (3CY), February 03 2013, Boulder County, Colorado. Picture: Amar Ayyash.

Amar's blog.

2nd gen flight feathers, marked dark outerwebs of outermost primaries. No mirror on P10. Part of the scapular region grey, but all wing-coverts and tertials still pale brown. Dark iris and bi-coloured bill.