A long-running and bitterly fought dispute over whether the earliest known hominin had a knuckle-walking gait, like ...

Humans walking on two legs consume only a quarter of the energy that chimpanzees use while “knuckle-walking” on all fours, according to a new study. The finding, detailed in the July 17 issue of the ...

A recent UA-linked study hypothesize that walking on two legs evolved because it used a smaller amount of energy than knuckle walking or walking on all fours. The study, presented in the July 17 issue ...

The chimp with the most human-like gait and body type walked upright more efficiently than he knuckle-walked a finding that study co-author Herman Pontzer calls a snapshot of how this evolution may ...

In zoology, the term “bipedal” refers to animals that use only two legs for walking. There are several groups of modern species considered habitual bipeds, meaning two-legged walking is their normal ...

WASHINGTON (Reuters) - The way orangutans navigate fragile tree branches in search of fruit has led scientists to propose that human ancestors with similar lifestyles may have begun walking on two ...