1. Department of Natural Sciences, Manchester Metropolitan University, Manchester, United Kingdom;
2. Cornell Lab of Ornithology, Cornell University, Ithaca, New York, USA;
3. BirdLife International, Cambridge, United Kingdom;, , ,
4. Department of Geography, Environmental Management and Energy Studies, University of Johannesburg, Johannesburg, South Africa
5. BirdLife South Africa, Johannesburg, South Africa;
6. Department of Ecology and Territory, Pontificia Universidad Javeriana, Bogota, Colombia;
7. Nature Conservation Foundation, Bangalore, India;
8. Department of Zoology, University of Cambridge, Cambridge, United Kingdom