Which came first in hominid evolution: language or bipedalism?
This article by Philip Lieberman On the subcortical bases of the evolution of language, page 22, he asserts the neurons associated with language may have developed based on the demands of bipedal posture. While there's no concrete data to support when we see the first languages, here we see evidence of arches (and presumably bipedal posture) in Australopithecus afarensis. So there are still some dots that need connecting.