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

Scientists working in Ethiopia's Afar Region have made discoveries that rewrite our understanding of early human history. For ...

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

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

One of the biggest unanswered questions in human evolution is when our ancestors first stood upright and began walking on two ...

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

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

WASHINGTON - Two skeletons nearly 2 million years old and unearthed in South Africa are part of a previously unknown species that scientists say fits the transition from ancient apes to modern humans.