Faithful Couples Are More Fertile
Monogamous couples produce 25% more offspring, especially if you’re a monkey.
Monogamy is relatively rare among mammals, but the study, of owl monkeys in Argentina, has highlighted how important having just one mate can be.
The wide-eyed nocturnal monkeys are considered a socially monogamous species, but scientists found when a new mate usurps one of the pair, there are fewer newborns than with pairs that stay together.
It’s thought the birth rate difference could be down to the time it takes for new pairs to get to know one another.