The female langurs who had their babies killed by the new leading male did not leave the group, and resumed estrus one after another, mating with the “murderous” male.

This behavior was initially regarded as an abnormality due to an excessive density of individuals. But when similar behaviors were later found in various other mammals, including other primates, a functional explanation of the occurrence of infanticide was considered.

■References (Books, papers, Web articles, etc.)
『子殺しの行動学： 霊長類社会の維持機構をさぐる』　　杉山幸丸　（講談社学術文庫、1993）

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