Thayer's Gull (thayeri)

(last update: January 22, 2013)

Thayer's Gull sub-adult, February 15 2014, North Point Marina, Winthrop Harbor, IL. Picture: Maarten van Kleinwee.

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Sub-adult bird (3rd or 4th cycle), 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. In this bird outer primaries also much adult-like in pattern. This is combined with brown in the coverts, black markings in the tail and on the bill.