Dear PF Forum, I've been wondering about this one thing in the extinction of early hominid. Homo erectus Homo habilis Australopithecus. They were all extinct. Why? Who killed them? What killed them? I read that the spreading of homo erectus (2 million years ago?) reached China and Java. Did homo sapiens kill them? If so, they (homo erectus) spread accross the world, did homo sapiens really kill them all? Or homo erectus evolved to become homo sapiens? Just in case anybody have any idea Thanks you very much.