1. Departamento Fauna Terrestre, Centro de Ecología Aplicada del Neuquén (CEAN), Junín de los Andes, Neuquén, Argentina.
2. Patagonian and Andean Steppe Program, Wildlife Conservation Society, Junín de los Andes, Neuquén, Argentina.
3. Department of Biology, Montana Tech of the University of Montana, Butte, Montana.