Hrdy’s hypothesis was supported by subsequent studies. Of all mammals, it is among primates that infanticide is most widespread.

However, infanticide does not occur frequently in all primate species. In Japanese macaques, only a few cases have been reported in over 50 years of field studies. In addition, there are large regional differences in the frequency of infanticide in chimpanzees and gorillas.

■References (Books, papers, Web articles, etc.)
The Woman That Never Evolved: With a New Preface and Bibliographical Updates, Revised Edition　　Sarah Blaffer Hrdy　Harvard University Press; Revised edition (December 20, 1999)
The Chimpanzees of Gombe: Patterns of Behavior　　Jane Goodall　 Belknap Press (September 1, 1986)
How Humans Evolved (Eighth Edition)　　Robert Boyd, Joan B. Silk　W. W. Norton & Company; Eighth edition (December 1, 2017)
『人間性はどこから来たか——サル学からのアプローチ』　　西田利貞　（京都大学学術出版会、1999）

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