Posted on Friday, 11 February, 2011 | 9 comments| News tip by: Still Waters
Image credit: Claire Huock
It is thought that our distant ancestors started walking on the ground up to 4.2 million years ago.
The timing of the switch suggests that it was influenced by a number of factors including changes in climate and an increase in grasslands meaning fewer trees and a greater need to cross the open ground between them.
"Early human ancestors stopped swinging in trees and started walking on the ground sometime between 4."