The remains recovered from the cave complex include the earliest example of Homo erectus - a direct human ancestor
Two million years ago, three different human-like species were living side-by-side in South Africa, a study shows.
The findings underline a growing understanding that the present-day situation, where one human species dominates the globe, may be unusual compared with the evolutionary past.
The new evidence comes from efforts to date bones uncovered at a cave complex near Johannesburg.
The research has been published in the journal Science.
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