Thayer's Gull (thayeri)

(last update: January 22, 2013)

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

Thayer's Gull 1st PB moult (2CY), June 08 2014, Sheboygan - Manitowoc, WI. Picture: Amar Ayyash.

Bird in complete moult: P1-P2 replaced, P3-P4 dropped, P5-P10 old juvenile. Note moult in wing-coverts and upper tertials, with new feathers obvious colder grey and barred.