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This is a museum quality reproduction of a Homo ergaster Skull. This Homo ergaster skull, designated as KNM-ER 3733, was discovered by B. Ngeneo in Koobi Fora, Kenya in 1975. It is a very complete example of an adult female and dates back to 1.75 million years ago.
Fossils are just too costly and some are one-of-a-kind that can only be viewed at museums. This fossil reproduction is an exact copy of the actual fossil. The replica Homo ergaster Skull measures 185mm long.
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Africa. This species was Homo ergaster. Traditionally, scientists have referred to this species as Homo erectus and linked this species name with a proliferation of populations across Africa, Europe, and Asia. Yet, since the first discoveries of Homo erectus, it had been noted that there were differences between the early populations of "Homo erectus" in Africa, and the later populations of Europe, Africa and Asia. Many researchers now separate the two into distinct species Homo ergaster for early African "Homo erectus" and Homo erectus for later populations mainly in Asia. Since modern humans share the same differences as H. ergaster with the Asian H. erectus, scientists consider H. ergaster as the probable ancestor of later Homo populations.
H. ergaster had a rounded cranium and a prominent browridge. Its teeth were much reduced in size, especially when compared to Australopithecus. Several features that distinguish H. ergaster from H. erectus are thinner bones of the skull and the lack of an obvious sulcus, or depression, just behind the browridge.
By 1.6 million years ago, an advance in stone tool technology is identified with H. ergaster. Known as the Achulean stone tool industry, it consisted of large cutting tools, primarily hand axes and cleavers. Originally thought to be responsible for the spread of early humans beyond Africa, it is now known that the migration out of Africa predates this tool industry.
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