Stock Photo - Tundra swans fly near Bergenhausen, Germany, 13 March 2015. The birds use the stay in North Germany's largest consecutive marsh area at the Eider, Treene, and Sorge rivers to gather the necessary energy reserves for the difficult flight to the Siberian breeding habitat. Photo: CARSTEN REHDER/dpa | usage worldwide. - Bergenhusen/Schleswig-Holstein/Germany

Stock Photo: Tundra swans fly near Bergenhausen, Germany, 13 March 2015. The birds use the stay in North Germany's largest consecutive marsh area at the Eider, Treene.

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