Thayer's Gull (thayeri)

(last update: January 22, 2013)

Thayer's Gull 3rd cycle (4CY), February 15 2014, North Point Marina, Winthrop Harbor, 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 brown in the coverts, dark mottling in the neck and flanks. Tail predominantly white with black remnants. The bill has a light-pink base, yellow tip and black subterminal band.