Lesser Black-backed Gull 4cy H934 October 16 2012, Utrecht, the Netherlands. Picture: Herman Bouman.
Ring series used at Amrum & Helgoland Islands, N Germany; two colonies in the transition zone between continental graellsii ("Dutch intergrade") and Scandinavian intermedius. Project run by Sönke Martens.
Moult score: P8/P10.
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