Salonga National Park, Democratic Republic of the Congo — Bonobos, often referred to as the “hippie ape” for their peaceful nature and conflict resolution strategies, have recently been involved in an alarming incident that challenges their reputation. Researchers have documented a violent attack among these usually gentle primates, raising questions about aggression within their communities.
On February 18, 2025, a group of researchers studying the LuiKotale bonobo community heard unexpected screams echoing through the forest. Initially suspecting a hunt, the team quickly discovered that the commotion surrounded a 19-year-old male bonobo named Hugo, who lay prone on the ground, encircled by five adult females. What unfolded over the next half hour would mark a significant departure from the typical behavior observed in bonobo groups.
While the specifics of the attack’s catalyst remain unclear, evidence suggests that Hugo may have posed a threat to an infant bonobo. Just days prior, he had been seen interacting aggressively with another female’s infant, potentially provoking the brutal response. In a previous case, similar aggressive behavior was recorded in a different bonobo population, which resulted in a coordinated attack.
The stark reality of the violence during this incident was shocking. The five females — Polly, Tao, Ngola, Djulie, and Bella — relentlessly inflicted damage on Hugo, targeting sensitive areas such as his ears, face, and even his testicles. Each injury underscored a level of aggression rarely observed among bonobos, known for their preference for social bonding over conflict.
As the brutal scene unfolded, members of the community watched from a safe distance of five to ten meters. Among the bystanders was Hugo’s half-brother, who did not step in to assist. After 25 harrowing minutes, the attack ceased. Instead of fleeing, the attackers began to groom each other and tended to Hugo’s injuries, licking both his wounds and their own blood in a behavior that remains puzzling to researchers.
Despite suffering severe injuries, Hugo managed to take a few steps before fleeing. His current whereabouts remain unknown, leading researchers to speculate on his fate. It’s important to note that bonobos often engage in a fission-fusion social structure, so it is possible he may reemerge, having taken time to recover away from the group.
The broader implications of this incident prompt critical discussions about the nature of aggression in bonobo societies. Typically, displays of aggression among bonobos tend to be non-lethal, involving charging or intimidation rather than physical violence. This attack, however, highlights that even the most pacifist of species will respond with aggression if circumstances warrant it.
Researchers caution against overgeneralizing this event, emphasizing that the vast majority of bonobo interactions are marked by cooperation and social harmony. Nevertheless, it is a stark reminder that even the most peaceful creatures may need to assert themselves when faced with threats.