American Herring Gull (smithsonianus)
(last update: October 30, 2015)
Vega Gull (vegae) 1st cycle (2CY), January 31 2010, Choshi, Japan. Picture: Gullog.
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Very similar to European Herring Gull argenteus. 1st gen flight feathers. Piano key pattern on GC but hardly any notching on TT.
Wing-coverts and tertials juvenile. Scap moult: US=75-99%, LS=1-25%, TOT SCAPS=50-75%.