Flexibility of Continental Navigation and Migration in European Mallards van Toor, Mariëlle L. ; Hedenström, Anders ; Waldenström, Jonas ; Fiedler, Wolfgang ; Holland, Richard A. ; Thorup, Kasper ; Wikelski, Martin Abstract Publication: PLoS ONE Pub Date: August 2013 DOI: 10.1371/journal.pone.0072629 Bibcode: 2013PLoSO...872629V