LBBG graellsii 2cy H709 April 09 2010, Pinto, Spain. Picture: Javier Marchamalo.
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.
Most wing-coverts eem to be juvenile, except 2 central mc.


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