Bua Noi lies listlessly in the far corner of her enclosure, surrounded by concrete, bars and thick glass, with only a few ropes and a car tire for distraction during her 30-year confinement. But the crowd of visitors at the privately run Pata Zoo on the roof of an old Bangkok mall wants to see more of the female gorilla. An employee lures Bua Noi (“little lotus”) with a sachet of milk. Finally she gets up, lumbers past the only patch of sunlight in the 10 by 20-metre pen and comes closer. Dozens of cell phones snap and film the only gorilla in the whole of Thailand. She in turn stares blankly …