Geographically, Erectus was the most occurring Homo Fossil man indicating a vast expansion of species across desert, Islands, river valley, and mountains. The occurrence of its site globally, when compared to those of Neanderthal, is proof Erectus of nature of experimentation and migration. This character is considered to be the reason for its survival in difficult conditions.
Due to differences in the ecosystem, Erectus occurred in several regional varieties. This variation led to Homo Sapiens of different racial stocks. The evidence of Homo erectus with the confirmation for the first time emerged during 1960 is in Africa by Michael Dey, who was instrumental in placing Erectus as an independent species apart from Australopithecus and Homo Sapiens.
Similar to Australopithecus the variations in Erectus fossil led to a multitude of terminologies such as plesianthropus, Atlanthropus, Sinanthropus, etc. All of these were later brought under the title Homo erectus, but based on variations in physical features and locality of finds were divided into: