Within-winter movements: a common phenomenon in the Common Pochard Aythya ferina

Keller I, Korner-Nievergelt F & Jenni L
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Keller, I., Korner-Nievergelt, F., & Jenni, L. (2009). Within-winter movements: a common phenomenon in the Common Pochard Aythya ferina. Journal für Ornithologie, 150(2), 483-494. https://doi.org/10.1007/s10336-008-0367-x