Thayer's Gull (thayeri)(last update: January 22, 2013) |
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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. |