Researchers at the University of Washington in Seattle say they may have discovered evidence of a previously unknown hominid species that interbred with humans in Africa as recently as 20,000 years ago. The species is believed to have coexisted with both humans and Neanderthals. Researchers say our species' record of interbreeding with other hominid groups may provide clues as to why humanity is so diverse. "Given that introgression is present in these very diverse groups, I think we can now say that this seems to be a pretty universal aspect of human history," said researcher Benjamin Vernot.
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