These considerations also help to clarify factors that deter infanticide. These include factors such as a nocturnal lifestyle, infant care in the nest, a paired society, a small size-difference between the sexes, and prolonged female receptivity for mating.

Some of these factors, such as a pair-type society and a small size-difference between the sexes, are in line with our human characteristics. This suggests that humans have evolved behavioral and social characteristics that prevent infanticide during the process of evolution.

■References (Books, papers, Web articles, etc.)
『暴力はどこからきたか——人間性の起源を探る』　第5章　暴力の自然誌―子殺しから戦争まで　　山極寿一　（NHKブックス、2007）

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■The References list of “Evolution of Human Sociality”