Thayer's Gull (thayeri)

(last update: January 22, 2013)

Coordinators:
Amar Ayyash (USA)
Mars Muusse (Netherlands)

Thayer's Gull 1st cycle (1CY), December 2009, California, US. Picture: Chris Gibbins.

Visit: Chris's weblog.

Extensive dark central tail-feathers and pale window on inner primaries. Heavily / densely patterned uppertail and undertail coverts. Note pale crescents on primary tips.