Fox, A.D., Clausen, K., Dalby, L., Christensen, T. and Sunde, P. 2016. Between-year variations in sex/age ratio bias in hunter wings of Eurasian Wigeon (Anas penelope) compared to field samples. Ornis Fennica. 93, 1 (Mar. 2016), 26–30. DOI:https://doi.org/10.51812/of.133885.