Did different species of early humans interbreed and produce offspring of mixed ancestry? New research with howler monkeys suggests it’s possible.
Recent genetic studies suggest that Neanderthals may have bred with anatomically modern humans tens of thousands of years ago in the Middle East, contributing to the modern human gene pool. But the findings are not universally accepted, and the fossil record has not helped to clarify the role of interbreeding, which is also known as hybridization.
A University of Michigan study of interbreeding between two species of modern-day howler monkeys in Mexico is shedding light on why it’s so difficult to confirm instances of hybridization among primates—including early humans—by relying on fossil remains.
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Photo credit: Milagros González via U. Michigan/Flickr