1. FitzPatrick Institute of African Ornithology, Department of Biological Sciences, University of Cape Town, Rondebosch, South Africa
2. Centre for Statistics in Ecology, Environment and Conservation, Department of Statistical Sciences, University of Cape Town, Cape Town, South Africa
3. Centre for Functional Biodiversity, School of Life Sciences, University of KwaZulu-Natal, Scottsville, South Africa
4. BirdLife South Africa, Isdell House, Johannesburg, South Africa
5. BirdLasser, Lejint (Pty) Ltd, Johannesburg, South Africa
6. A.P. Leventis Ornithological Research Institute, Jos, Nigeria
7. School of Animal, Plant and Environmental Sciences, University of the Witwatersrand, Johannesburg, South Africa
8. Ornithology Section, National Museums of Kenya, Nairobi, Kenya
9. Department of Biological Sciences, University of Cape Town, Cape Town, South Africa
10. The Biodiversity and Development Institute, Cape Town, South Africa