Human history features a pivotal moment when four-legged beings stood upright on two legs. Scholars regard this shift as the ...

A seven-million-year-old fossil may mark the moment our ancestors first stood up and walked.

A seven-million-year-old skull found in Chad sits at the center of a long argument about human origins. The species, ...

A group of anthropologists’ new analysis offers powerful evidence that Sahelanthropus tchadensis—a species discovered ...

Scientists may have cracked the case of whether a seven-million-year-old fossil could walk upright. A new study found strong ...

A big difference between humans and other apes is the ability to stride easily on two feet. A new analysis of fossil bones shows that adaptations for bipedal walking go back 7 million years.

The oldest ancestor of humans may be a seven-million-year-old ape, which started walking upright two million years earlier than other hominids.

A new fossil analysis supports the idea a human ancestor was walking upright far earlier than previously thought.

Scientists uncover fossils suggesting Sahelanthropus tchadensis, a 7-million-year-old ancestor, could walk upright. Could this tiny bipedal ape-like hominin rewrite what we know about the earliest ...

New study of 7-million-year-old fossils from Chad proves Sahelanthropus tchadensis walked upright while still climbing trees.

One of the biggest questions in human evolution asks why humans became habitually bipedal about 7 million years ago. Most of our primate cousins do well walking quadrupedally and switch to two legs ...