Individual Variation in Migration and Wintering Patterns of Long‐Tailed Ducks Clangula hyemalis From a Population in Decline by Thiemo Karwinkel, Ingrid L. Pollet, Sandra Vardeh, Julia Loshchagina, Petr Glazov, Alexander Kondratyev, Aleksandr Sokolov, Vasiliy Sokolov, Julius Morkūnas, Daniela J. Tritscher, Juan F. Masello, Götz Eichhorn, Helmut Kruckenberg, Petra Quillfeldt, Jochen Bellebaum

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