Figure 3. Left humeri in posterior view: Ailurus (arboreal; CMNH 19723); Nasua (arboreal; CMNH 17611); Felis (generalized; CMNH 17713); Protypotherium (YPM-PU 15828; from Sinclair 1909); Myocastor (semifossorial; FMNH 49892); Dasyprocta (cursorial; FMNH 60408); and Erethizon (arboreal; FMNH 47173). Scale bar equals 5 cm.