>I'm not an expert in this area, but why are bipeds considered more capable
>of walking long distances? the implication is that we became biped in
>order to walk further distances but  it seems to me that four legged
>animals do just fine roaming around the earth for great distances so
>becoming biped may have been for other reasons and not necessarily for
>running, hunting or road kill, tho those may have been side effects.

Being a biped allow you to carry things in, your arms while
travelling.

jean-claude