There may have been as many as 20 or as few as 5 hominid species in existence during the last 6 myr.

Name: There may have been as many as 20 or as few as 5 hominid species in existence during the last 6 myr.
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The exact number of hominid species that existed over the past 6 million years is still debated among scientists, but there is evidence to suggest that there were at least 5 and possibly as many as 20 different species.

There May Have Been as Many as 20 or as Few