The reason why mountain gorillas form multiple male groups

Multi-male groups are often observed in Virunga because sons may not leave their natal groups after they mature. In other words, the males in the multi-male group are fathers and sons.

On the other hand, in Kahuzi, both males and females leave their natal groups as they reach sexual maturity.

The difference in this male movement pattern is likely to be largely related to the presence or absence of infanticide.

Gorillas in the Mist  Diane Fossey Dr.  Mariner Books; 1st Mariner Books Ed edition (October 6, 2000)
ゴリラ 第二版』 第5章 変化する社会  山極寿一 (東京大学出版会、2015)

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