ホモ・ハビリス
Early humans (hominids) used stone tool technology, such as a hand axe that was similar to that used by primates, which are found to have intelligence levels of modern children aged 3 to 5 years. Intelligence and use of technology did not change much for millions of years. The first "Homo" species began with "Homo habilis" about . "Homo habilis" ("handy man') created stone tools called Oldowan tools. "Homo ergaster" lived in eastern and southern Africa about and used more diverse and sophisticated stone tools than its predecessor, "Homo habilis," including having refined the inherited Oldowan tools and developed the first Acheulean bifacial axes.