Sergey Uryadnikov /

January 7, 2013; Source: New York Times

In soliciting and accepting donations, charities are naturally reliant on the human impulse to do good and to share, and now, scientists have some new insights as to the roots of that impulse. Duke University evolutionary biologists Jingzhi Tan and Brian Hare have recently published an article in the journal PLOS ONE titled, “Bonobos Share with Strangers.” The authors consider humans’ “propensity to share with non-relatives and even strangers” to be “one of the most puzzling human behaviors from an evolutionary perspective.” In a series of experiments with bonobos, an ape closely related to the chimpanzee, at an animal sanctuary in the Democratic Republic of Congo, however, the researchers believe they may have caught a glimpse of where that behavior comes from.

The researchers’ findings “show that even when there was no immediate social reward, bonobos are still motivated to help a stranger acquire out-of-reach food.” In the experiments, bonobos were given a helping of food and the chance to release a stranger, and the bonobos opted to help the stranger achieve freedom, and then shared their food with that stranger. Next, the bonobo that had been freed would go free another bonobo who was in the same predicament that he or she had just escaped.

The researchers found that this process appeared to be greased by the lubrication of social interaction. The bonobos wouldn’t share their own food without it. They would, however, help strangers reach other food even without social interaction. Tan, one of the two authors of the study, tells the New York Times, “It’s like when you donate money and you don’t tell people…so there’s no way for you to get any benefit.”

The Times notes that, “Along with chimpanzees, bonobos are among the closest primates to humans,” but chimps typically do not share with strangers. Thus we might think of the charge of the development officer as helping people shy away from their chimp-like tendencies in order to instead embrace their bonobo side. –Mike Keefe-Feldman