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Argentatus vs michahellis, 02.10.07

Argentatus vs michahellis, 02.10.07

To find and identify correctly an adult Herring Gull amongst a flock of YLG in Switzerland at this period of the year is often very difficult. Many pictures labelled "Herring" taken in september or october in Switzerland show often 3 o 4 cy YLG with a...

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