A magnificent verdant swathe across the steep ridges of the Albertine Rift Valley, this ancient rainforest - one of the few in Africa to have flourished throughout the last Ice Age - is home to roughly half of the world's mountain gorillas. Looking deep into the expressive brown eyes of these gentle giants is surely the most exciting and poignant wildlife encounter that Africa has to offer - but we should not let it distract from Bwindi's broader biodiversity, a result of its immense antiquity and an altitude span from 1,160 to 2,607m. The national park has 90 mammal species, including 11 primates, of which the black-and-white colobus, with its lovely flowing white tail, is prominent. The forest birding ranks with the best in Uganda, with 23 highly localised Albertine Rift endemics present.