The chance of seeing the mountain gorillas on a trek to Bwindi National Park is 100%. Uganda has about 15 gorilla families that have gone through a habituation process and are visited regularly by tourists from all over the world. 14 of these groups are found in Bwindi and one group, Nyakagezi (as locally known) is located in the nearby Mgahinga Gorilla National Park. All you need to see a gorilla is a tracking permit and you are guaranteed to encounter the great apes in their forest homeland. Bamboo Ecotours can secure your tracking permit all year round (which not all tour operators can promise).