Affiliation: | 1. Animal Behaviour, Department of Evolutionary Biology and Environmental Science, University of Zurich, Winterthurerstrasse 190, 8051, Zurich, Switzerland;2. Behavioural Ecology Research Group, Anglia Ruskin University, East Road, Cambridge, CB1 1PT, UK;3. Biological Anthropology, Department of Archaeology, University of Cambridge, Fitzwilliam St, Cambridge, CB2 1QH, UK |