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How many early human species existed on earth?



We Homo sapiens did not tend to be alone. Long ago, there was much more human diversity; Homo sapiens lived with an estimated eight now extinct species human 300,000 years ago. As recently as 15,000 years ago, we shared caves with another human species known as Denisovans. And fossilized remains indicate an even higher number of early human species that once populated the earth before our species followed.

“We have a human species right now, and historically it is very strange,” said Nick Longrich, an evolutionary biologist at the University of Bath in the United Kingdom. “Not so far back, we were not so special, but now we are the only ones left.”

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