1. Senckenberg Forschungsinstitut und Naturmuseum, Abt. Messelforschung und Mammalogie, Senckenberganlage 25, 60325 Frankfurt am Main, Germany
2. Turkana Basin Institute, Social and Behavioral Sciences, Stony Brook University, Stony Brook, New York 11794, U.S.A.
3. Department of Integrative Biology and Physiology, University of California, Los Angeles, Los Angeles, California 90095, U.S.A.,
4. Turkana Basin Institute, Social and Behavioral Sciences, Stony Brook University, Stony Brook, New York 11794, U.S.A.,
5. Wake Forest University, Department of Anthropology, Winston Salem, North Carolina 27109-7807, U.S.A.,
6. Department of Anthropology, Stony Brook University, Stony Brook NY 11794, U.S.A.,