1. Landcare Research; PO Box 69040 Lincoln 7640 New Zealand
2. Veterinary Population Medicine, University of Minnesota; 1988 Fitch Ave St Paul MN 55108 USA
3. Inst. of Zoology, Zoological Society of London, Regent's Park; London NW1 4RY UK
4. Tanzania Wildlife Research Inst.; PO Box 661 Arusha Tanzania
5. Serengeti Biodiversity Program, Tanzania Wildlife Research Inst.; PO Box 661 Arusha Tanzania
6. Beaty Biodiversity Centre, Univ. of British Columbia; Vancouver BC V6T 1Z4 Canada
7. Boyd Orr Centre for population and Ecosystem Health, Inst. for Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences, Univ. of Glasgow; Glasgow UK
8. Dept of Anthropology; Univ. of Texas Austin; 1 University Station C3200 Austin TX 78712 USA