This group was researched by dian fossey, it derived its name from the river Susa which used to flow in the home range of these mountain gorillas. This is a very beautiful family that every visitor may want see once he or she comes to Rwanda. However, this is the most difficult family to trek because it is found far in the mountains and therefore visitors find it harder for them to trek them. This group is very interesting with a family size of 28 gorilla individuals with three silverbacks. This group is known for its twins that is the impano and the byishimo which are prettier and playful hence making many tourists interested. Here the tourists get to see the mother of twins Nyabitondore take care of the twins, breast feeding them and carrying them.

However, this is the most difficult family to trek because it is found far in the mountains and therefore visitors find it harder for them to trek them. This group is very interesting with a family size of 28 gorilla individuals with three silverbacks. This group is known for its twins that is the impano and the byishimo which are prettier and playful hence making many tourists interested. Here the tourists get to see the mother of twins Nyabitondore take care of the twins, breast feeding them and carrying them.