American Herring Gull (smithsonianus)(last update: December 8, 2013) |
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European Herring Gull (argentatus) 1CY / 1st cycle, November 19 2013, Katwijk aan Zee, The Netherlands.Dark on upperparts, greater covert bar and lacking the notched tertial fringes. Note however broadly spaced white lines on undertail coverts. |