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The Javanese Anthropopithecus, which in its skull is more human than any other known anthropoid ape, already had an upright, erect posture, which has always been considered to be the exclusive privilege of humans.
Eugene Dubois -
Thus the evidence given by those five new thigh bones of the morphological and functional distinctness of Pithecanthropus erectus furnishes proof, at the same time, of its close affinity with the gibbon group of anthropoid apes.
Eugene Dubois