Australopithecine
Their arms were longer in proportion to their bodies, and this also suggests their inherited capacity to move above the ground. The efficiency of their walking is difficult to estimate, but they were not so well adapted to bipedalism as humans. The males were much larger than the females, which suggests a family arrangement with a dominant male and several females, as with modern apes. Nothing is known for certain about their use of tools. 2nd ed, Chicago, chapter 4, p144.Wood B.A. 1994. Evolution of australopithecines. The Cambridge encyclopedia of human evolution'. 8th ed, Cambridge University Press.