LBBG graellsii 2cy H891 April 22 2010, Pantín, Spain. Picture: Antonio Gutierrez.
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.
Wing-coverts, tertials and tail still juvenile.
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