More oxytocin receptors lead to greater monogamy

Psychology Today recently published an article comparing monogamy in certain types of animals, including prairie voles, meadow voles and barn swallows, with each other and with humans. Prairie voles and humans had the most oxytocin receptors and were also more regularly monogamous than most of the other animals in the study. Meadow voles, which generally are not monogamous, became a lot more faithful to a single mate when researchers increased the number of oxytocin receptors in their brains.

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