A new study in owl monkeys (Aotus azarai) reveals that, when an owl monkey pair is severed by an intruding individual, the mate who takes up with a new partner produces fewer offspring than a monkey who sticks with its tried-and-true partner. An owl monkey group (M. Corley / Owl Monkey Project) The findings, published in the journal PLoS ONE, underscore how monogamy and pair-bonds – relatively rare social formations among mammals – can...
