Homo ergaster
It is not known for sure which hominin species was first to create Oldowan tools. The emergence of tool culture has also been associated with the pre-"Homo" species "Australopithecus garhi", and its flourishing is associated with the early species "Homo habilis" and "Homo ergaster". Beginning 1.7 million years ago, early "Homo erectus" apparently inherited Oldowan technology and refined it into the Acheulean industry.