What humans turned into humans? This is a fundamental theme of anthropology, and may be ultimate target when we get to know us. However, the theme is also very difficult to explain. Now, only human beings of a kind merely called humans (Homo sapiens sapiens) survive. However, by the time this human is born, there were many processes on the evolution and there was extinction of many kinds of hominids. There are many features which humans have been further acquired from the initial life to the vertebrate in various stages, such as the mammals, the primates, the hominoids and fossil hominids. In other words, they are the stamps which show that it was adapted for the native habitat of the time in each stage. The most fundamental feature that distinguishes an ape and human beings (fossil hominids also including) is bipedal locomotion, and it is supposed that the features peculiar to humans, such as encephalization, use of a tool, and linguistic competence, are progressed after bipedal locomotion is gained. It comes out that the movement style of this bipedal locomotion was acquired in East Africa of 5 million to 8 million years ago, and it is thought under the influence of reduction of the forest by the change of the environment. To move a life place on the ground from a tree must have been a change surprising for the animals. Since not only the problems of the food and habit change, but change arose in the danger of predation or disaster, the family, a social relation, and a locomotion and body structure was further influenced with regards to them. It may be having the big influence which humans comes to live a life by space separate from the earth, like as the change to terrestrially from arboreality in the near future. I want to consider that humans change how in that case, or that it must change.
