Being a mom is hard enough, but imagine mothering someone else’s kids, too. That’s the norm for golden snub-nosed monkeys, according to a new study in the journal Science Advances. Scientists found that over a five-year period, more than 87 percent of golden snub-nosed monkey infants were nursed by females other than their mothers – a phenomenon called allonursing.

Read the whole story at National Geographic: Why Do These Monkeys Nurse Each Other's Babies?