Most agree that Lucy's foot and mode of walking were already quite modern, thanks to a few 3.2 - million - year - old foot bones from A.
afarensis adults, a 3.3 - million - year - old infant, and 3.7 - million - year - old footprints in Tanzania, thought to be made by the same species.
The ancient toddler shows key anatomical features of A.
afarensis, including a shoulder blade midway in shape between that of a human and a gorilla, along with features rarely seen, like a full set of both baby and
adult teeth.