Roughly 1.8 million years ago, Homo ergaster first appeared in the fossil record in Africa. From Homo ergaster, Homo erectus (upright man) evolved 1.5 million years ago. Some of the earlier representatives of this species were small-brained and used primitive stone tools, much like H. habilis. The brain later grew in size, and H. erectus eventually developed a more complex stone tool technology called the Acheulean. Potentially the first hominid to engage in hunting, H. erectus mastered the art of making fire. They were the first hominids to leave Africa, going on to colonize the entire Old World, and perhaps later on giving rise to Homo floresiensis. Although some recent writers suggest that H. georgicus, a H. habilis descendant, was the first and most primitive hominid to ever live outside Africa, many scientists consider H. georgicus to be an early and primitive member of the H. erectus species.[19]
