I just want to point out that Australopithecus afarensis, africanus, and sediba all have "S" curves in their spines. I will even site a creationist source for sediba.
http://ngm.nationalgeographic.com/print/2006/07/bipedal-body/ackerman-text
http://www.answersingenesis.org/articles/aid/v8/n1/sashaying-to-throne-sediba
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