1. Behavioral Ecology and Sociobiology Unit; German Primate Center, Leibniz Institute for Primate Research; Kellnerweg 4 37077 Göttingen Germany
2. Nocturnal Primate Research Group, Oxford Brookes University; Oxford OX3 0BP UK
3. Tanzania Forest Conservation Group; PO Box 23410 Dar es Salaam Tanzania
4. School of Natural & Social Sciences; University of Gloucestershire; Francis Close Hall Swindon Road Cheltenham Gloucestershire GL50 4AZ UK
5. Department of Neuroanatomy; MA 01/43; Ruhr University; 44780 Bochum Germany
6. 1185 East 39th Place Eugene OR 97405 USA
7. Endangered Primate Rescue Center, Cuc Phuong National Park; Nho Quan District, Ninh Binh Province Vietnam
8. Department of Natural Sciences; National Museums Scotland; Chambers Street Edinburgh EH1 1JF UK
9. Institute of Geography; School of GeoSciences; University of Edinburgh; Drummond Street Edinburgh EH8 9XP UK
10. Institute of Anthropology; University of Mainz; Anselm-Franz-von-Bentzel-Weg 7 55128 Mainz Germany
11. Cognitive Ethology Laboratory; German Primate Center, Leibniz Institute for Primate Research; Kellnerweg 4 37077 Göttingen Germany
12. Gene Bank of Primates and Primate Genetics Laboratory; German Primate Center, Leibniz Institute for Primate Research; Kellnerweg 4 37077 Göttingen Germany