Besides the mountain gorillas, the Virunga Mountains are home to a good population of chimpanzees. Within the Virunga National Par, you can visit the Tongo Chimps on a guided walk. Chimpanzee watching is one of the interesting primates safaris in East and Central Africa. Visitors can go and look for these animals in the dense forest on foot.
Tracking chimpanzees can be easier given that they can be rather loud, so the chances of encountering them is very real. However the watching experience can be different given that they are always up in the tree branches.