“A summary of the morphologic and functional affinities of the Hadar hand fossils leads inexorably to an image of a suspensory adapted hand, surprisingly similar to hands found in the small end of the pygmy chimpanzee-common chimpanzee range”
J. Stern, R.
Sussman, 1983. AmericanJournal of Physical
Anthropology, 60:279-312, p284.