1 Department of Human Evolutionary Biology, Harvard University, Cambridge, MA, USA. carmody@fas.harvard.edu areese@ucsd.edu.
2 Department of Human Evolutionary Biology, Harvard University, Cambridge, MA, USA.
3 Division of Biological Sciences, Section of Ecology, Behavior, and Evolution, University of California, San Diego, La Jolla, CA, USA. carmody@fas.harvard.edu areese@ucsd.edu.