Identification of American Herring Gull in a western European context
Identification of American Herring Gull in a western European context
Identification of American Herring Gull in a western European context
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36 <strong>American</strong> <strong>Herr<strong>in</strong>g</strong> <strong>Gull</strong> / Amerikaanse Zilvermeeuw Larus smithsonianus, first-w<strong>in</strong>ter, Boston, Massachusetts,USA, February 1999 (Pat Lonergan). Very dist<strong>in</strong>ctive <strong>in</strong>dividual with bicoloured bill, contrast<strong>in</strong>gly pale head, darklower h<strong>in</strong>dneck cont<strong>in</strong>uous with uniformly dark underparts and many reta<strong>in</strong>ed juvenile scapulars. Note dark baseto greater coverts and dense pattern<strong>in</strong>g on vent and undertail-coverts. 37 <strong>American</strong> <strong>Herr<strong>in</strong>g</strong> <strong>Gull</strong> / AmerikaanseZilvermeeuw Larus smithsonianus, first-w<strong>in</strong>ter, Boston, Massachusetts, USA, January 2001 (Pat Lonergan). Notepronounced greater-covert bar, and that, unusually for second calendar-year smithsonianus, bill has acquiredvery little pale at base.14
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