Thayer's Gull (thayeri)

(last update: January 22, 2013)

Thayer's Gull 3rd cycle (4CY), February 14 2014, Lake County Fairground, Libertyville, IL. Picture: Maarten van Kleinwee.

Visit: Maarten's blog for many more images!

Individual aged by the adult-looking inner primaries (grey with white tips), and the pattern on the central primaries (adult-like blackish pattern with clear cut edges) and clear cut mirror on P10. This is combined with much brown in the coverts, dark mottling in the neck and flanks, broad tail-band. The bill has a light-pink base, yellow tip and black subterminal band.

Note the purple orbital ring starting to appear.