1. BirdLife South Africa, Private Bag X16, Pinegowrie 2123, South Africa and DST-NRF Centre of Excellence at the FitzPatrick Institute, Department of Zoology and Entomology, University of Pretoria, Private Bag X20, Hatfield, Pretoria 0028, South Africa
2. Birds of Prey Programme, Endangered Wildlife Trust, 27 and 28 Austin Road, Glen Austin AH, Midrand 1685, South Africa and Centre for Functional Biodiversity, School of Life Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville 3209, Sou
3. Department of Environmental Science and Technology, University of Maryland, 1426 Animal Sciences Building, College Park, MD 20742 USA
4. BirdLife South Africa, Private Bag X16, Pinegowrie 2123, South Africa and Applied Behavioural Ecological & Ecosystem Research Unit (ABEERU), UNISA, Florida, South Africa
5. Department of Anthropology, University of Maryland, 1111 Woods Hall, 4302 Chapel Lane, College Park, MD 20742 USA
6. Department of Biology and Biochemistry, University of Houston, Houston, TX 20742 USA