1. a The Peregrine Fund , 5668 West Flying Hawk Lane, Boise, Idaho, 83709, USA
2. d Ornithology Section, Department of Zoology , National Museums of Kenya , PO Box 40658–00100, Nairobi, Kenya
3. b Kenya Professional Safari Guides Association , PO Box 24397–00502, Nairobi, Kenya
4. c All Out Africa Research Unit, Department of Biological Sciences , University of Swaziland , Private Bag 4, Kwaluseni, Swaziland