Thayer's Gull (thayeri)
(last update: January 22, 2013)
Thayer's Gull 1st cycle (2CY), January 19 2011, Half Moon Bay, CA. US. Picture: Peter Adriaens.
Dark tail and pale window on inner primaries. Fine uniform dark texture on underparts and in the neck. Barred on uppertail coverts and vermiculation on axilaries.
