Australopithecus Was Only an Ape
     Australopithecus had an upright posture, as indicated by the entry position of the spine into the skull.  The spine entered the skull from the bottom, not from an angle.  An angle would indicate a quadraped, or the occasional biped, like an ape.  The bottom entry position indicates that Australopithecus was an upright walker.  Biomechanical studies performed on the hips also indicates bipedial locomotion.  One last piece of evidence that Australopithecus was not an ape is the canines which did not protrude beyond the other teeth in a functional manner.  In this Australopithecus resembles homo sapien, and no other primate.
     With the brain of an ape, and the upright posture of a man, Australopithecus is the transitional fossil.