A new study published in Current Biology has revealed that male crested macaques are more likely to invest in their offspring if they were born within a socially monogamous relationship. The researchers found that males who had formed a monogamous relationship with a female were more likely to invest in the offspring of that relationship than those who had not. This investment includes providing food, protection, and affection to the offspring, as well as engaging in cooperative behaviors with the mother. The results of this study suggest that male crested macaques may have evolved to invest more in their offspring when they are born within a socially monogamous bond. This could be an important factor in the evolution of monogamy in primates.

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source: Phys.org