Most Homo habilis fossils derive from Olduvai Gorge, Africa (Isaac & Leakey 1960). Several fragmentary specimens indicate that this species possessed an enlarged brain (Durant 1989). Among the fossils found in this area, the smallest brain had a cranial capacity of 550 cc. The brains of two other fossils were measured to be 650 cc and 687 cc. An additional cranium fossil was found at Koobi Fora, KNM-ER 1470 and KNM-ER 1813. Unfortunately, little is known about this fossil. Moreover, anthropologists date that H. habilis originated between 2 and 1.9 million MYA, followed by Homo erectus, which dates to approximately 1.7 MYA. As a result, H. habilis was the first species that possessed the characteristic enlarged brain. This enlarged brain is also closely associated with the ability of using stones for tool-making.


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