Analysis of the shape of the braincase of seven-million-year-old Sahelanthropus tchadensis from Chad supports the claim that it is the oldest human ancestor on record.
The femur of Orrorin tugenensis, a putative human ancestor that lived six million years ago in Kenya, has a shape that is intermediate between that of fossil apes and early members of the human lineage—a finding that confirms previous claims thatthe creature walked upright.
Tiny, rarely preserved middle-ear bones from two of our ancient relatives that lived millions of years ago exhibit modern features, which may indicate an early shift in hearing ability.
The latest round of studies of Australopithecus sediba, a nearly two-million-year-old relative of ours from South Africa, reveals a previously unknown form of upright walking and decidedly humanlike jaws and teeth. But is it the ancestor of our genus, Homo?Not so fast.