1. Centre for the Evolution of Cultural Diversity, University College London, 31–34 Gordon Square, London WC1H OPY, UK. Ethnologie Préhistorique, CNRS UMR 7041, 21 Allée de l'Université, F-92023 Nanterre, France.
2. Institut de Préhistoire et de Géologie du Quaternaire, CNRS UMR 5199, Avenue des Facultés, 33405 Talence, France; and Department of Anthropology, George Washington University, Washington, DC.
3. Department of Palaeontology, The Natural History Museum, London SW7 5BD, UK.
4. Department of Mineralogy, The Natural History Museum, London SW7 5BD, UK.
5. Department of Zoology, Tel Aviv University, 69978 Tel Aviv, Israel.