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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