The Eastern Lowland Gorilla is a sub species closely related to the Mountain Gorilla, which resides in the mountains bordering Rwanda, Uganda and DRC. There are small differences between the two sub species. The Eastern Lowland Gorillas found in Kahuzi Biega are larger in size, with a bigger, longer face and fewer nose prints.
Male gorillas fight over three main things, territory, females and food. In Kahuzi Biega National Park disputes have occurred between the two habituated families, the Chimanuka and Mugaruka, named after the dominant male silverbacks. The latest dispute resulted in Chimanuka winning, after which he subsequent took all of the females and infants from Mugaranka for himself.
There are nine gorilla families in Kahuzi Biega. Two are habituated for visitors, Chimanuka and Mugaruka, both named after the dominant male silverback. Chimanuka is the silverback of a large family containing 36 members. Along with him there are 17 females and 18 infants aging from 6 months to 9 years old. The family is famous for having 4 sets of twins, a phenomenon unseen in any Eastern Gorilla populations. Mugaruka lost one hand in a poachers trap and is now a solitary male after losing his accompanying females and infants in a fight with Chimanuka.