1. School of Natural Resources and the Environment, N335 Environment and Natural Resources 2, University of Arizona, Tucson, AZ 85721, USA
2. U.S. Fish and Wildlife Service, Division of Scientific Authority, 5275 Leesburg Pike, MS: IA, Falls Church, VA 22041-3803, USA
3. Proyecto de Conservación de Aguas y Tierras, ProCAT Colombia/International, Carrera 11 # 96-43, Of. 303, Bogotá, Colombia
4. Haub School of Environment and Natural Resources, University of Wyoming, 201 Bim Kendall House, Laramie, WY 82072, USA