Most human fossils are only found outside of the rainforest. This is mainly due to the fact that fossils seldom remain in the rainforest soil. However, fossils of earlier apes have not been found in the areas in which human fossils have been found. This implies that, among the apes, only the human ancestors advanced into the savannahs.

■References (Books, papers, Web articles, etc.)
How Humans Evolved (Eighth Edition)　　Robert Boyd　W. W. Norton & Company; Eighth edition (December 1, 2017)

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■The References list of “Evolution of Human Sociality”