Herring Gull - Zilvermeeuw (argentatus & argenteus)(last update: 08 december 2003) |
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Herring Gull adult (argentatus), November 16 2002, Westkapelle, the Netherlands (51.33N-03.25E). Two argentatus adults and one Lesser Black-backed Gull. Note the grey-tone of the upper-parts and low primary moult score. The large, powerful, dark grey bird left has yellowish legs. From June (often mid-May in France, Belgium and
the Netherlands) to October, a complete moult will bring birds in
so-called "adult winter" plumage. A new set of primaries will
grow during the summer months and by late November, the average argenteus in the Netherlands and northern
France has completely moulted all primaries. At the same time, the wing-covert moult is completed by the end
of the month. Argentatus from Scandinavia are behind in
primary moult.
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