This argument rested on observations of locomotion in chimpanzees and gorillas, coupled with the presumption that the post-cranium of our last common ancestor (LCA) of Pan and Homo was fundamentally similar to those of extant African apes (but see Filler 1981). 1982), upright walking in early hominids was argued to have relied on a bent-hip–bent-knee (BHBK) gait (see, e.g. For several decades, largely subsequent to the recovery of A.L.288-1 (‘Lucy’) ( Johanson et al.
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