Two decades ago Batwa pygmies were thrown out of their native forests in Uganda to make way for the country's mountain gorilla tourism. Tommy Trenchard and Aurelie Marrier d'Unienville went to Rukeri in Uganda find out what happened next. On a bleak volcanic plain at the foot of Mount Muhabura in the south-western corner of Uganda several ramshackle huts of sticks and grass lie scattered among the