Capuchins are the brainiest monkeys in the world, yet strangely those in captivity appear to be much smarter than those in the wild. "Wildlife on One" sets out to discover why. The journey reveals capuchins that are capable of making flint knives, sees monkeys using poker counters like 'monkey money' and witnesses individuals who can cooperate in extraordinary ways. The answer to the Monkey Puzzle is revealed in the jungles of Brazil by a discovery that's rocking the scientific world - wild capuchins are filmed for the first time using hammers and anvils living in a society based entirely on the ability to use tools.