Why is gorilla trekking in Mgahinga national park expensive?: Gorilla trekking could be the most expensive safari activity in the world as of today. Mountain gorillas cannot survive in captivity and for this reason, travelers who want to see them can only see them in 4 national parks in the world. Mountain gorillas live in the thick vegetation cover of Mgahinga national park, Virunga national park, Volcanoes national park, and