The Kyaguliro gorilla group occupies a unique position in Uganda’s gorilla conservation history. Based in Ruhija sector — the highest and most remote entry point in Bwindi Impenetrable National Park — the Kyaguliro group has been the subject of long-term research by the Dian Fossey Gorilla Fund’s Ellen DeGeneres Campus, and its 2018 fission produced two new groups whose subsequent trajectories have been documented in detail. Understanding how and why large gorilla groups divide is central to understanding mountain gorilla population dynamics, and the Kyaguliro split offers one of the most complete case studies available.
The Kyaguliro Group Before the Split
By 2017 the Kyaguliro group numbered nineteen individuals, including the dominant silverback Kyaguliro, two subordinate silverbacks, several adult females, and a cohort of juveniles and infants born during a period of high reproductive success. The presence of two mature subordinate silverbacks — males who had grown up within the group but had not yet established independent family units — created the social pressure that researchers have identified as the primary driver of gorilla group fission.
The tension between the dominant silverback and the two subordinates had been observed by researchers for over a year before the split occurred. Dominance interactions — chest beats, bluff charges, physical displacement from feeding sites — were increasing in frequency and intensity. The two subordinates had begun to associate more closely with specific females, suggesting the social alignment that precedes female transfer and group formation.
The Fission Process
Gorilla group fission does not happen suddenly. It is a process that unfolds over weeks or months, as subsets of the group begin spending more time at the periphery of the group’s range and gradually reduce their association with the main group. The Kyaguliro fission followed this pattern: beginning in early 2018, one of the subordinate silverbacks began spending periods of one to three days separated from the main group, accompanied by two adult females.
By June 2018 the separation was effectively complete. The main Kyaguliro group, led by the dominant silverback, retained twelve individuals. The departing group, which researchers designated Kyaguliro B and which would later be named the Bikingi group, comprised seven individuals under the departing silverback’s leadership. A third, smaller sub-group — two females and an infant — briefly existed before the females integrated with the Bikingi group.
Research Significance
The Kyaguliro fission was valuable to researchers for several reasons. Both resulting groups remained in Ruhija sector, allowing direct comparison of their subsequent trajectories under observation by the same research team. The Kyaguliro group (original) maintained its territory and reproductive pattern. The Bikingi group, starting from seven individuals, has grown steadily and was formally habituated for tourism in 2021, providing a new trekking option at Ruhija sector.
Visiting Ruhija in 2027
Trekkers who visit Ruhija sector in 2027 may trek to either the Kyaguliro group or the Bikingi group — two family units that share a common history and a common territory, now living separate lives that researchers continue to document. The Ruhija trek is the most demanding in Bwindi — steep, high-altitude terrain that rewards the effort with a sector that receives fewer visitors than Buhoma or Rushaga. The gorilla permit costs $800. At Ruhija, you walk into a story that scientists are still writing.
