Tracy L. KivellAnimal Postcranial Evolution (APE) Lab, Skeletal Biology Research Centre, School of Anthropology and Conservation, University of Kent, Canterbury, UKDepartment of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, GermanyPierre LemelinDivision of Anatomy, Department of Surgery, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, CanadaBrian G. RichmondDivision of Anthropology, American Museum of Natural History, New York, NY, USADaniel SchmittAnimal Locomotion Lab, Department of Evolutionary Anthropology, Duke University, Durham, NC, USA