1. a Mitrani Centre for Desert Ecology , Jacob Blaustein Institute for Desert Research, Ben-Gurion University , Sede Boqer Campus, Israel
2. b Department of Mathematical Statistics , University of Cape Town , Rondebosch, 7700, South Africa
3. c 3 Oriel Road, Pietermaritzburg, 3201
4. d FitzPatrick Institute, University of Cape Town , Róndebosch, 7700
5. e Percy FitzPatrick Institute of African Ornithology, University of Cape Town , Rondebosch, 7700
6. f National Directorate of Forestry and Wildlife, Ministry of Agriculture , P.O. Box 1406, Maputo, Mozambique