1. a A vian Demography Unit, Department of Statistical Sciences , University of Cape Town , Rondebosch, 7700, South Africa
2. b Percy FitzPatrick Institute of African Ornithology , University of Cape Town , Rondebosch, 7700, Cape Town
3. c Fitz Patrick Institute , University of Cape Town , Rondebosch, 7700, South Africa
4. d Cytopathology Laboratory , Medical School, University of Cape Town , Rondebosch, 7770, South Africa
5. e Ministry of Wildife, Conservation & Tourism , Private Bag 13306, Windhoek, Namiiu
6. f Department of Ornithology , National Museum , PO Box 266, Bloemfontein, 9300, South Africa
7. g PO Box 97, Jagersfontein, 9974, South Africa
8. h National Museum , PO Box 266, Bloemfontein, 9300, South Africa
9. i PO BOX 882, Lydenburg, 1120, South Africa