By  Robin Smith for Futurity.

Acts of kindness to strangers aren’t the unique domain of humans, research shows.

Bonobos that live in Africa’s Congo Basin will go out of their way to help strangers too, says Jingzhi Tan, a postdoctoral associate in evolutionary anthropology at Duke University.

A previous study by Tan and associate professor of evolutionary anthropology Brian Hare found that bonobos share food with strangers. Now, in a new series of experiments, researchers wanted to find out just how far this kindness goes.

So they studied wild-born bonobos at the Lola ya Bonobo sanctuary in the Democratic Republic of Congo and discovered that they’ll help a stranger get food even when there is no immediate payback.

Sixteen bonobos were led one at a time into one of two adjacent rooms separated by a fence. The researchers hung a piece of apple from a rope just above the empty room, visible but out of reach.

The apes couldn’t access the fruit or the rope. But if they climbed the fence they could reach a wooden pin holding the rope to the ceiling and release the dangling fruit, causing it to drop within reach of any bonobo that entered the next room.

The bonobos released the fruit roughly four times more often when an unfamiliar bonobo was in the adjacent room than when the room was empty.

Bonobos, like humans, may simply be eager to make a good first impression.

What’s more, the bonobos didn’t wait to be asked for help, they just offered it. The researchers changed the size of the mesh surrounding the stranger’s room so that in some trials they were able to stick their arms through the openings in the screen to beg for the treat, and in other trials they were not. The bonobos helped just as often whether the stranger gestured for help as when they didn’t.

Bonobos’ impulse to feel for strangers isn’t entirely under conscious control. In another experiment, they had 21 bonobos watch a series of short videos. In some videos, the apes saw a familiar group member either yawning or making a neutral expression. In other videos they watched complete strangers from the Columbus Zoo in the US behaving the same way.

The same way we yawn after watching someone else yawn, yawning is contagious in bonobos, too. Previous studies suggest the phenomenon is linked to a basic form of empathy called “emotional contagion,” when one person’s mood triggers similar emotions in others around them. Stranger yawns were just as contagious as those of groupmates.

The impulse to be nice to strangers probably evolves when the benefits of bonding with outsiders outweigh the costs, says Tan, now a postdoctoral scholar at the University California, San Diego.

Female bonobos leave the group where they are born to join a new group when they reach adulthood, where they form bonds with other unrelated adults they’ve never met. Bonobos, like humans, may simply be eager to make a good first impression.

“All relationships start between two strangers,” Tan says. “You meet a stranger, but you may meet them again, and this individual could become your future friend or ally. You want to be nice to someone who’s going to be important for you.”

The findings appear in Scientific Reports. The National Science Foundation supported the work.

Source: Duke University

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