University of Wisconsin–Madisonimages.library.wisc.edu/EcoNatRes/EFacs/PassPigeon/...Whistling...
12
University of Wisconsin–Madisonimages.library.wisc.edu/EcoNatRes/EFacs/PassPigeon/...Whistling Swans at Green Bay and Wautoma, a Mallard x Pintail hybrid at Beloit, a Blue-winged