Gibbons are small tree-dwelling monkeys with no real predators. But in Indonesia where the native forests are being ravaged by oil palm production, young gibbons are often captured and kept as pets. When they reach sexual maturity, at around 7 years of age, and become aggressive they are either killed or caged in deplorable conditions. A remarkable young Frenchman, Aur?lien Brul?, moved to Indonesia to save the gibbon. His breathtaking courage and determination are an inspiration. He is winning a pitched battle with the authorities that has left many others in the dust.