LBBG graellsii 2cy H543 April 13 2008, Madrid, Spain. Picture: Delfín González.
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.
Scapulars and upper tertial replaced.

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