Black & White Colobus Monkey Tracking. These charismatic monkeys – sometimes referred to as Ruwenzori Colobus - take up the final place in Rwanda’s Big-4 primate species. Nyungwe Forest is again home to this attractive species. Because they live within sizeable groups (one of the habituated troops has more than 200 individuals), an encounter with Colobus Monkeys in Rwanda often exceeds sightings anywhere elsewhere in Africa.