1. Wyoming Cooperative Fish and Wildlife Research Unit Department of Zoology and Physiology University of Wyoming Laramie WY USA
2. Program in Ecology University of Wyoming Laramie WY USA
3. Haub School of Environment and Natural Resources University of Wyoming Laramie WY USA
4. Department of Zoology and Physiology University of Wyoming Laramie WY USA
5. Wyoming Game and Fish Department Thayne WY USA
6. U.S. Geological Survey Wyoming Cooperative Fish and Wildlife Research Unit Department of Zoology and Physiology University of Wyoming Laramie WY USA