Topic: Biology

Scientists have discovered fossils in Ethiopia that show early humans and their relatives lived together. This changes our understanding of how humans evolved.

Fossils found in Ethiopia are rewriting one of the biggest stories about human history. Instead of a straightforward march from ape-like ancestors to modern humans, evidence suggests that several human relatives shared the same African landscape at the same time. An international research team studying fossils from the Ledi Geraru field site found evidence that Australopithecus and the earliest known members of Homo lived in the same region between 2.6 and 2.8 million years ago. The fossils also point to an Australopithecus species that has not been found anywhere else.

The team determined that the Ledi Geraru Australopithecus teeth did not belong to Australopithecus afarensis (the famous 'Lucy'). This supports the view that there is still no evidence of Lucy's species surviving later than 2.95 million years ago.

'This new research shows that the image many of us have in our minds of an ape to a Neanderthal to a modern human is not correct -- evolution doesn't work like that,' said ASU paleoecologist Kaye Reed. 'Here we have two hominin species that are together. And human evolution is not linear, it's a bushy tree, there are life forms that go extinct.'

Why It Matters

This discovery matters because it shows us that human evolution was more complex and messy than we thought. It also highlights the importance of finding more fossils to understand how our ancestors lived.

Key Facts

• Fossils found in Ethiopia show early humans and their relatives lived together
• The fossils are around 2.6-2.8 million years old
• Australopithecus and Homo species coexisted in the same region
• The discovery changes our understanding of human evolution

Key Terms

Hominin

A type of early human or human-like ancestor

Implications

This discovery matters because it shows us that human evolution was more complex and messy than we thought. It also highlights the importance of finding more fossils to understand how our ancestors lived.