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Homo ergaster
Homo ergaster ("working man") is an extinct hominid species (or subspecies, according to some authorities) which lived throughout eastern and southern Africa between 1.9 to 1.4 million years ago with the advent of the lower Pleistocene and the cooling of the global climate.
Note: The above text is excerpted from the Wikipedia article "Homo ergaster", which has been released under the GNU Free Documentation License.
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