In the tropical forest refugia1 that were narrowed by aridification in the glacial age, human ancestors competed with other apes and monkeys for food. It is thought that this food competition brought humans to the savannah. The skull of Saherlanthropus tchadensis, which is thought to be one of the earliest humans, suggests that they had already become capable of bipedal locomotion 7 million years ago. 2
■References (Books, papers, Web articles, etc.)
The Dawn of Human Culture Richard G. Klein Wiley; 1 edition (March 1, 2002)
1The specific areas in which many species survived during periods of harsh climate conditions, such as the glacial ages.
2Sometimes one can see graphic representations of the evolution of our human ancestors which depicts then evolving from the four-legged locomotion to bipedalism. However, humans have walked with only their two hind legs on the ground since they lived in trees. Therefore, bipedalism was evolved not through quadrupedal locomotion, but through arboreal locomotion. [Editorial note]
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