1. Eugène Marais Chair of Wildlife Management, Mammal Research Institute, Department of Zoology and Entomology, Faculty of Natural and Agricultural Sciences, University of Pretoria, Private Bag X20, Hatfield, 0028 South Africa
2. Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE, 68503-0984, U.S.A.
3. South Africa Hunters and Game Conservation Association, Montana Park, 0159 South Africa