Humans who went into the savanna faced two problems: sparsely-distributed food, and a large number of predators. How did our ancestors overcome these problems?
Until the middle of the 20th century, anthropologists believed that humans dealt with those problems by developing the skills of tool use and communication, facilitated by their enlarged brain and high degree of intelligence.
■References (Books, papers, Web articles, etc.)
『人類進化論——霊長類学からの展開』 第7章 人類進化の謎に挑む 山極寿一 （裳華房、2002）
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