1. US Geological Survey, Fort Collins Science Center, 2150 Centre Avenue, Building C, Fort Collins, Colorado 80526, USA
2. Prairie Wildlife Research, PO Box 308, Wellington, Colorado 80549, USA
3. US Forest Service, Wall Ranger District, 710 Main Street, Wall, South Dakota 57790, USA
4. National Park Service, Badlands National Park, 25216 Ben Reifel Road, Interior, South Dakota 57750, USA