1 Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany; Department of Archaeology and Anthropology, National Museum, Bloemfontein, South Africa; Department of Archaeology, University of Cape Town, South Africa. Electronic address: will.archer@eva.mpg.de.
2 Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany; Interdisciplinary Center for Archaeology and the Evolution of Human Behaviour, Universidade Do Algarve, Portugal.
3 Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany. Electronic address: mcpherro@eva.mpg.de.