1. Nelson Institute for Environmental Studies, University of Wisconsin–Madison, 1630 Linden Drive, Madison, WI 53706, USA.
2. International Crane Foundation, E-11376 Shady Lane Road, Baraboo, WI 53913, USA.
3. College of Natural Resources, University of Wisconsin–Stevens Point, 800 Reserve Street, Stevens Point, WI 54481, USA.
4. Department of Forest and Wildlife Ecology, University of Wisconsin–Madison, 1630 Linden Drive, Madison, WI 53706, USA.