1. School of Social Sciences, Oxford Brookes University, Oxford, OX3 0BP, UK
2. Movement Ecology Lab, Department of Ecology, Evolution and Behavior, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
3. Institute of Biology, National Autonomous University of Mexico, CP 04510 Mexico City, Mexico
4. Department of Anthropology, University of Texas at Austin, Austin, TX 78712, USA