You won’t catch an owl monkey sneaking off and philandering. Aotus azarae, also known as night monkeys, win the prize for being the finest dads in the primate world; researchers have found that they’re the first primate species—besides humans—to demonstrate real faithfulness and monogamy. In 18 years of observing the monkeys, scientists never caught the owl monkeys cheating, and tests reveal genetic monogamy, where the father and mother raising the infants are the true biological parents. The scientists, who reported their findings online today in the Proceedings of the Royal Society B, believe the species’ rare display of faithfulness is tied to the males’ significant involvement in raising their youth, which includes time spent playing with and feeding them.
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