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Kuehl,  Hjalmar       
Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;
Great Ape Evolutionary Ecology and Conservation, Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;

Williamson,  Liz
Department of Developmental and Comparative Psychology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;

Sanz,  Crickette M.       
Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;

Morgan,  David
Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;

Boesch,  Christophe       
Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;
Chimpanzees, Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;