An Angolan Colobus monkey (Colobus angloensis ruwenzori) in the high canopy of the Nyungwe Forest. The magnificent Angolan Colobus can be seen in large troops at Nyungwe. One particular troop is 400-strong, making it the largest of any arboreal primate group in Africa.Covering 970 square kilometres, this Forest is one of the largest montane rain forests in Africa; it is also one of the oldest because it was largely unaffected by the last Ice Age. The diversity of life in Nyungwe is outstanding in an African context; no less than thirteen primate species live there including chimpanzees. Also, found there are more than 190 species of trees, over 100 different orchids and 275 species of birds with 24 endemic to the Central African Highlands.