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The documentary starts in the days of Australopithecus afarensis, and goes on to tell the story of Paranthropus boiseiParanthropus aethiopicus ''Paranthropus boisei ''Paranthropus robustus Paranthropus is an extinct genus of bipedal hominid that is probably descended from the Australopithecine hominids Australopithecus . All species of Paranthropus were bipedal, and many, Homo habilisHomo habilis ("handy man") is a species of the genus Homo which lived from approximately 2. 5 million to 2. 0 million years ago. The definition of this species goes back to Louis Leakey who found fossils in Tanzania, East Africa, in 1964. Homo habilis is and Homo rudolfensisThe species Homo rudolfensis was originally proposed in 1986 by V. Alexeev for the specimen KNM ER 1470. Originally thought to be a member of the species Homo habilis much debate surrounded the fossil and its species assignment. It was thought that 2 mill, Homo ergasterHomo ergaster ("workman man") is an extinct hominid species (or subspecies, according to some authorities) which arose in Africa some 1. 9 million years ago. ergaster is sometimes categorized as a subspecies of Homo erectus''. It is currently in contentio and Homo erectusHomo erectus ("upright man") is a hominid species that is believed to be an ancestor of modern humans. The species is found from the middle Pleistocene onwards. It had fairly modern human features, with a larger cranial capacity than that of Homo habilis', Homo heidelbergensisHomo heidelbergenis is an extinct species of the genus Homo and the common ancestor of both the Neanderthal man Homo neanderthalensis and the Cro-Magnon man Homo sapiens . It descended from the morphologically very similar Homo erectus''. However, H., and finally Homo neanderthalensis and modern Homo sapiens (likely the same species which is reading this article). Each species segment takes the form of a short drama featuring a group of the particular ape in question going about their daily lives (the search for food, protecting territory, and caring for the sick and injured). The intent is to get the human viewer to feel for the creatures being examined, almost to imagine being one of them (one trait which the documentary links to the modern human brain).