It took a while for humans to climb the food chain.
Most paleobiologists believe humanity truly began around 2 million years ago with a species known as Homo habilis.
According to an analysis of tiny injuries on two fossilized H. habilis jaw fragments, some researchers now believe our ancestors required a bit more time to ascend the food chain.
The evidence is explored in a study published in the Annals of the New York Academy of Sciences.
A team at Spain’s University of Alcalá examined small tooth marks on the H. habilis fossils originally recovered from the Olduvai Gorge in Tanzania.
Author's summary: Humans may have been prey longer than thought.