Thayer's Gull (thayeri)
(last update: January 22, 2013)
Thayer's Gull 2nd cycle (2CY), December 08 2012, Lake County, IL, US. Picture: Amar Ayyash.
2nd gen flight feathers, where P10 shows a 'ghost mirror'. Note fine vermiculation on the tips of P1-P4. Scapular region almost completely grey, but still intermixed with pale brown feathers. Tail almost completely dark and bill predominantly dark.
