The second behavioral evolution is the increase of animal source foods in the diet.*
It is thought that this occurred prior to the encephalization. The first stone tools were excavated in Ethiopia, and dated from approximately 2,500,000 years ago—prior to the beginning of the encephalization. It is believed that at this time, humans used knife-like stone tools, not for hunting, but for cutting and eating the meat of dead animals.
■References (Books, papers, Web articles, etc.)
The Dawn of Human Culture Richard G. Klein Wiley; 1 edition (March 1, 2002)
『家族進化論』 第2章第16節 脳の増大と食の改変 山極寿一 （東京大学出版会、2012）
*Animal source food contains 10 to 20 times more calories than leaves, and 2 to 5 times more calories than fruit.
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