Chimp hand on left, human hand on right. The wrist bones are in the weight-bearing direction in chimps.
Comparison of Chimp, Human, and Ardi hands (from top to bottom)
This shows that there is a same general size of the proximal tibia in both Ardi (what's being held) and Humans.
In chimps, a sulcus is present.
Whereas in
Ardipithecus ramidus, a sulcus is not present. Post-orbital constriction is present.
In
Kenyanthropus platyops, post-orbital constriction is present.
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