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Researchers call it the \u201ccommon enemy effect\u201d: we tighten our bonds when we believe we\u2019re facing the same challenge.<\/p>\n
It\u2019s not just a human thing. Chimpanzees<\/a> do it. And now a new study suggests bonobos also do it \u2013 just in their own, quieter style. Somewhere along their evolutionary path, bonobos leaned hard into social connection, and it shows.<\/p>\n Bonobos, bonding, and cohesion<\/p>\n The new findings hint that the link between outside threats and inside togetherness isn\u2019t new at all. It may go back several million years, to a time before humans, chimpanzees, and bonobos split into separate branches.<\/p>\n An international research team led by Kyoto University<\/a> set out to test an old idea that dates back to Darwin: groups that pull together when facing other groups may have had an advantage. That logic makes sense for animals with intense rivalries.<\/p>\n But bonobos complicate the story. They aren\u2019t famous for lethal raids or brutal turf wars. <\/p>\n So the researchers asked a simple question: if bonobos don\u2019t fight like chimps, do they still \u201ccircle the wagons\u201d when they sense outsiders nearby?<\/p>\n Bonobo basics<\/p>\n Bonobos sit right next to us on the family tree, sharing roughly 98.7% of their DNA with humans. They also stand out from their chimpanzee<\/a> cousins in one big way: bonobo society tends to run on cooperation more than confrontation.<\/p>\n They live in female-led communities where relationships matter \u2013 a lot. Bonobos often use sexual behavior to ease tension, settle disputes, and reinforce bonds. <\/p>\n They\u2019re leaner than chimps, with dark faces, pink lips, and strikingly expressive eyes that can feel almost human when they lock onto you.<\/p>\n In the wild, they spend plenty of time in the trees but move confidently on the ground too. <\/p>\n They forage for fruit, leaves, and small animals, and they communicate through a rich mix of calls, gestures, and facial expressions. In short: bonobos stay socially tuned-in, and they make connection a survival skill.<\/p>\n Bonobos bond when stressed<\/p>\n To find out how bonobos respond to outsiders, researchers observed eight groups across five sites in four countries. <\/p>\n They designed the experiment to mirror earlier chimpanzee studies: play recordings of calls from other groups and watch what happens next.<\/p>\n Lead author James Brooks put it bluntly: they didn\u2019t know what they\u2019d find.<\/p>\n If group bonding only matters in species that regularly engage in deadly conflict, bonobos might show nothing at all. <\/p>\n But if the common-enemy effect runs deeper \u2013 older than the split between chimps and bonobos \u2013 then bonobos might still carry traces of it.<\/p>\n They did.<\/p>\n The bonobos clearly noticed the outside calls. They became more alert \u2013 sitting upright more, resting less. They also showed a small uptick in affiliative behavior<\/a>, including grooming, which plays a central role in primate social life.<\/p>\n The key word is small. Compared with chimpanzees, the increase in bonding behavior was modest.<\/p>\n How bonobos react to outsiders<\/p>\n That subtle shift is the point. When chimpanzees detect outsiders, the response often comes with aggression. As with most primates, chimpanzee group tension rises, defensive behavior spikes, and conflict can escalate. <\/p>\n Bonobos take a different route. They still register the \u201coutgroup signal,\u201d but instead of gearing up for a fight, they lean into their social fabric<\/a>. They reinforce relationships without turning the dial toward violence.<\/p>\n That pattern suggests an evolutionary strategy built less around warfare and more around alliance-building. Bonobos don\u2019t ignore potential threats. Instead, they answer them with connection rather than aggression.<\/p>\n Shared past with humans<\/p>\n The authors suggest our shared ancestor<\/a> \u2013 living around 5-6 million years ago \u2013 may have dealt with some form of group conflict.<\/p>\n Over time, as bonobos evolved along a path with less intense intergroup violence, the strength of the common-enemy effect may have faded too.<\/p>\n Brooks summed up the bigger implication: conflict runs deep in our lineage, but it isn\u2019t destiny. Bonobos likely stopped lethal aggression altogether a long time ago.<\/p>\n Other great apes \u2013 including gorillas, orangutans<\/a>, chimpanzees, gibbons, and humans \u2013 have been observed killing members of their own species. Bonobos stand out as the exception that refuses to become the rule.<\/p>\n Importance of bonobo bonding<\/p>\n Bonobos give us a living example of how a close relative responded to the same evolutionary pressures and came out with a different social toolkit<\/a>.<\/p>\n If we want to understand why humans so easily fall into \u201cus versus them,\u201d it helps to know how deep those instincts go, and what alternatives evolution has already produced.<\/p>\n Senior author Shinya Yamamoto put it clearly: humans can do both. We can turn outsiders into enemies, and we can also cooperate across borders. Bonobos remind us that what our ancestors did doesn\u2019t lock us into one future.<\/p>\n And that\u2019s the real takeaway. The next time you feel yourself getting pulled into a tribal mindset \u2013 be it during an argument, a political fight, even a workplace dispute \u2013 pause and remember the bonobos. They prove that a species can sense threat, choose connection, and rewrite the script.<\/p>\n The study is published in the journal\u00a0PLOS ONE<\/a>.<\/p>\n \u2014\u2013<\/p>\n Like what you read? Subscribe to our newsletter<\/a> for engaging articles, exclusive content, and the latest updates.<\/p>\n Check us out on EarthSnap<\/a>, a free app brought to you by Eric Ralls<\/a> and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"As humans, we like to think we\u2019re one of a kind. 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