re: Wikileaks Cables Confirm Existence of Extraterrestrial Life...

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Animals have no need for distance running. We do it because we can, no animal would naturally try it.

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At this point in our place as a species, there is little need for it. Tens of thousands of years ago? It was an enormous advantage.

Quadrupeds lung capacity/breathing is limited by their strides. The mechanics of their running require them to inhale/exhale with each stride. Because we have two legs, a big arse, and a stable neck, we are able to breathe much more efficiently.