1. Conservation Genetics Group, Institute of Zoology, Zoological Society of London, Regent's Park, London NW1 4RY, UK,
2. Department of OB/GYN and Wisconsin Regional Primate Research Centre, 1223 Capitol Court, Madison, Wisconsin 53713‐1299, USA,
3. Department of Biology, University of California, Los Angeles, CA 90024, USA,
4. Zoological Institute, University of Copenhagen, Department of Population Biology, Universitetsparken 15, DK‐2100, Denmark