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Peking Man (Homo erectus pekinensis) is a subspecies of Homo erectus which inhabited the Zhoukoudian Cave of northern China during the Middle Pleistocene. The first fossil, a tooth, was discovered in 1921, and the Zhoukoudian Cave has since then become the most productive Homo erectus site in the world. Peking Man was instrumental in the foundation of Chinese anthropology, and fostered an important dialogue between Western and Eastern science for decades to come. The fossils became the centre of anthropological discussion, and were classified as a direct human ancestor, propping up the Out of Asia hypothesis that humans evolved in Asia. Peking Man also played a vital role in the restructuring of the Chinese identity following the Chinese Communist Revolution, and was intensively communicated to working class and peasant communities to introduce them to Marxism and science (overturning deeply-rooted superstitions and creation myths). Early models of Peking Man society strongly leaned towards communist or nationalist ideals, leading to discussions on primitive communism and polygenism. This produced a strong schism between Western and Eastern interpretations, especially as the West adopted the Out of Africa hypothesis by the late 20th century, and Peking Man's role in human evolution diminished as merely an offshoot of the human line. Though Out of Africa is now the consensus, Peking Man interbreeding with human ancestors is frequently discussed especially in Chinese circles.

Peking Man is characterised by a long and heavily fortified skull, featuring an inflated bar of bone circumscribing the crown, crossing along the brow ridge, over the ears, and connecting at the back of the skull, as well as a sagittal keel running across the midline. The bone of the skull and long bones is exorbitantly thickened. The face was protrusive (midfacial prognathism), eye sockets wide, jaws robust and chinless, and teeth large. Brain volume ranged from 850 to 1,225 cc, for an average of just over 1,000 cc (compared to an average of 1,270 cc for present-day modern males and 1,130 for present-day modern females). The limbs are broadly anatomically comparable to those of modern humans. H. erectus in such northerly latitudes may have averaged roughly 150 cm (4 ft 11 in) in height, compared to 160 cm (5 ft 3 in) for more tropical populations.

Peking Man lived in a cool, predominantly steppe, partially forested environment, alongside deer, rhinos, elephants, bison, buffalo, bears, wolves, big cats, and a menagerie of other creatures. Peking Man intermittently inhabited the Zhoukoudian Cave, but the exact chronology is unclear, with estimates as far back as 780,000 years ago and as recent as 230,000 years ago. This spans several cold glacial and warm interglacial periods. The cultural complexity of Peking Man is fiercely debated. If the inhabitants were capable of hunting (as opposed to predominantly scavenging), making clothes, and controlling fire, they would have been well-equipped to survive frigid glacial periods. If not, they would have had to retreat southward and return later. It is further disputed how the Peking Man fossils were predominantly deposited in the cave, either because they lived and died there, or they were killed by giant hyaenas (Pachycrocuta) and dumped there, in addition to other natural processes. Over 100,000 pieces of stone toolswere recovered, mainly small and inconsistently shaped flakes no more than 5 cm (2.0 in) long, but they were sometimes refined into scrapers, choppers, and, towards the later end of occupation, points, burins, and awls.[1]

Homo (from Latin homō 'man') is the genus that emerged in the genus Australopithecus that encompasses Homo sapiens, plus several extinct species, most notably Homo erectus and Homo neanderthalensis. The genus emerged with the appearance of Homo habilis just over 2 million years ago. Homo, together with the genus Paranthropus, is probably sister to Australopithecus africanus, which itself had previously split from the lineage of Pan, the chimpanzees.

Homo erectus appeared about 2 million years ago and, in several early migrations, spread throughout Africa (where it is dubbed Homo ergaster) and Eurasia. It was likely that the first human species lived in a hunter-gatherer society and was able to control fire. Homo erectus persisted for more than a million years and gradually diverged into new species by around 500,000 years ago.[1]

Homo erectus is an extinct species of human with the earliest fossils originating from about 2 million years ago. Several human species, such as Homo heidelbergensis and Homo antecessor, with the former generally considered to have been the ancestor to Neanderthals, Denisovans, and modern humans, appear to have evolved from Homo erectus. Homo erectus specimens are among the first recognizable members of the genus Homo. They  were the first human ancestor to spread throughout Europe and Asia, with a continental range extending from the Iberian Peninsula to islands in South East Asia. Homo erectus may also be ancestral to Homo floresiensis and possibly to Homo luzonensis. The last known population of H. erectus is the subspecies soloensis from Java, around 117,000–108,000 years ago.[1]

Australopithecus (from Latin australis 'southern', and Ancient Greek pithekos 'ape') was a genus of early hominins that existed in Africa during the Late Pliocene and Early Pleistocene. It is widely accepted that the genus Homo (which includes modern humans) emerged within Australopithecus, as sister to Australopithecus sediba. Also the genera Paranthropus and Kenyanthropus emerged within Australopithecus. Australopithecus is a member of the subtribe Australopithecina, which sometimes also includes Ardipithecus, though the term "australopithecine" is sometimes used to refer only to members of Australopithecus. Species include A. garhi, A. africanus, A. sediba, A. afarensis, A. anamensis, A. bahrelghazali and A. deyiremeda. Debate exists as to whether some Australopithecus species should be reclassified into new genera, or if Paranthropus and Kenyanthropus are synonymous with Australopithecus, in part because of the taxonomic inconsistency.

The earliest known member of the genus, A. anamensis, existed in eastern Africa around 4.2 million years ago. Australopithecus fossils become more widely dispersed throughout eastern and southern Africa, before eventually becoming pseudo-extinct 1.9 million years ago (or 1.2 to 0.6 million years ago if Paranthropus is included).[1]