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The implications for our possible early human ancestors, such as the species Australopithecus afarensis, are significant."Australopithecus afarensis possessed a rigid ankle and an arched, nongrasping foot," wrote Dominy and his co-authors in the report published in the Proceedings of the National Academy of Sciences (PNAS).

The findings have implications for some of our earliest possible ancestors, including the 3.5 million-year-old species Australopithecus afarensis, thought by many scientists to be the first known possible human predecessor to have forsaken arboreal life in the trees and live a life walking upright (bipedalism) on the ground.They tested their hypothesis by conducting ultrasound imaging of the fibers of the large calf muscles of individuals in all four groups.The results showed that the Agta and Twa tree-climbers had significantly longer muscle fibers than those of their agricultural counterparts and other "industrialized" modern humans.GFDL CC-BY-SA, Wikimedia Commons A handaxe from Olduvai Gorge, over 1 million years old.This stone tool is most often associated with Homo erectus, a hominin considered by many scientists to be a possible human (Homo) ancestor.

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