The park provides habitat for some 120 species of mammals ten of which are primates and more than 45 small mammal species, 348 species of birds, 220 species of butterflies, 27 species of frogs, chameleons, geckos and many endangered species. The park has a large variation of altitude and habitat types, there by supporting a variety of species of trees, reptiles, butterflies, birds, moths, and small mammals.
There are over 200 species of butter flies.
In terms of fauna, the Bwindi area is amongst the most diverse forests in East Africa, with more than 1,000 flowering plant species including 163 species of trees and 104 species of ferns. This Afromantame forest has dense under storey of fern, vines and shrubs. About 324 trees species have been recorded here, 10 of which occur no where else in Uganda. The northern sector which has a lower altitude is rich in species of the Guineo-Congolian flora. These include two species internationally recognised as endangered that is; Brown mahogany (Lovoa swynnertonii) and Brazzeia longipedicellata.