Right, so instead of Walking with Cavemen , u gott
Walking with Modern Age Men Dressed in Monkey-Suits.
it's not a big-deal for a man to crouch and more acuratelly act like a simian , we still have their genes and instinct inside us!
I'm not saying they should've grow a hump , or misstreat their spine in order to best perform a genuine Australopithecine behaviour, but even a school boy knows that Cavemen didn't walk UPRIGHT, but much more in a crouched position, shoulders swept down, neck lowered, head buckled, mouth grinned , that sort of things ...
I'm a cavemen, my dear fellow. To the bone. You should see me in the mornings, having my tea next to some deer, fresh killed or road-kill, doesn't actually matter to me as long as I have raw hide to sink my teeth in.
How do you know that their bone structure couldn't allow this to happen? Australopithecines had many anatomical features that show that they were quite good at walking upright.
When modern apes try to walk upright, they do so with a bent knee posture, a clumsy waddling gait, and torso that is bent over rather than straight. This posture is the only way they can walk upright for several reasons:
1. Their pelvises are very tall and relatively narrow. Their pelvises are also bent at an angle that prevents them from standing up straight like we do.
2. Their knee joints are (in most species) straight. This means that, when they try to walk on two legs, their center of gravity is not directly above the foot that is on the ground. As a result, their torso tends to fall to the side with every step. To avoid falling over, they must take small steps with their knees bent.
Australopithecines, however, had many skeletal adaptations that made them much better at walking upright than any modern ape species:
1. Their pelvises were short and wide like ours are. Furthermore, their pelvises were not angled like they are in apes.
2. Their knee joints were angled -- just like modern human knee joints are.
3. Australopithecine feet were *FAR* more like modern human feet than ape feet, as the link below shows:
4. Evidence of spinal curvature like that of humans. Modern humans have curved spines that help to keep the center of gravity directly above the feet. So, apparently, did australopithecus.
While there is no doubt that australopithecus walked upright, there is some disagreement among paleoanthropologists about how similar their gait was to that of modern humans. This, however, is a controversial issue.
So, I don't know what features of bone structure the original poster is referring to.