If they lived in trees, why did they need to walk upright?....................
“If they lived in trees, why did they need to walk upright?”
Climate change.
No, really.
One theory says that as the African climate dried out, groves of trees grew farther and farther apart, so the hominids that could walk best from one to another tree had a better chance to survive.
[singing] what's need got to do, got to do, with it...
To walk to the store for a six pack and some smokes?