1. School of Life Sciences; University of KwaZulu-Natal; Private Bag X01 Scottsville Pietermaritzburg 3209 South Africa
2. Department of Biology; University of New Mexico; MSC03-2020 Albuquerque NM 87131 USA
3. Department of Biology and Graduate Degree Program in Ecology; Colorado State University; Fort Collins CO 80523 USA
4. Department of Biological Sciences; Florida International University; North Miami FL 33181 USA
5. San Francisco Bay Bird Observatory; 524 Valley Way Milpitas CA 95035 USA
6. Okavango Research Institute; University of Botswana; Private Bag 285 Maun Botswana
7. South African Environmental Observation Network (SAEON); Ndlovu Node; Scientific Services; Kruger National Park, Private Bag X1021 Phalaborwa 1390 South Africa