Meaning "neighborliness", Umubano has 9 individuals: 1 Silverback; 1 Sub adult male; 3 Adult females and 4 Babies.
Led by Charles, the dominant silverback, Umubano was formerly a part of the Amahoro group. As Charles matured into a silverback of the same rank as Ubumwe, he could not stand being given orders and decided to stage a fight and challenge Ubumwe. The fight went on for weeks and then months. Finally, Charles managed to snatch from Ubumwe a few females and formed his own group. Since then, he has commanded respect and recognition from Ubumwe. We have observed, on various occasions, interactions between the two silverbacks, but no fighting has been seen since the great battle ended.