"Takao Furuno...decided to turn his farm organic..he stumbled across the traditional practice of using Aigamo ducks to protect rice. The ducks eat insects, pests and snails. They use their feet to dig up the weeds - in the process, oxygenating the water and strengthening the roots of rice plants...his "duck rice"...sells at 20 to..30 percent premium over conventionally grown rice"
Source: The power of unreasonable people
By John Elkington and Pamela Hartigan
Harvard Business Press.USA, 2008.