LBBG graellsii 2cy H725 April 10 2009, Madrid, Spain. Picture: Miguel Juan.
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.
Inner gc seems to be replaced. Exact moult stage hard to determine.
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