Our species, Homo sapiens, wasn't the only human species around.
Our species, Homo sapiens, inhabited the world at the same time as other human species, often living close to one another. In fact, Homo erectus, Homo floresiensis, Homo neaderthalensis, and Homo sapiens all co-inhabited the earth only 70,000 years ago.
When our species, Homo sapiens, left Africa for Europe and Asia about 80,000 years ago, they almost certainly would've encountered other species of early humans. Our ancestor, Homo erectus, had made it to Europe and Asia 1 million years earlier!
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