1. Department of Earth and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK
2. North of England Zoological Society, Chester Zoo, Caughall Road, Chester CH2 1LH, UK
3. Department of Zoology, University of Oxford, Oxford OX1 3SZ, UK
4. Lewa Wildlife Conservancy, PO Box, Private Bag, Isiolo 60300, Kenya
5. Ol Jogi Ltd., PO Box 259-10400, Nanyuki, Kenya
6. Grevy's Zebra Trust, PO Box 15351-00509, Nairobi, Kenya
7. Ol Pejeta Conservancy, PO Box 167, Nanyuki, Kenya