Owl monkeys that stay with their original reproductive partner have 25% more young than those who change partners, which researchers say should suggest how monogamy may have evolved in humans. The study, published in the journal PLoS ONE, suggests that the evolution of monogamy and pair bonds may have improved the species' reproductive fitness. "Monogamy makes sense for these primates, because the male who sticks to a female is certain about the paternity of the young, and so he invests in their care," said anthropologist Eduardo Fernandez-Duque, the study's co-author.

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