*quacking sounds* That is the sound of ducks. Are you picturing these birds fishing or floating on a nice lake somewhere? A normal reaction to be sure -- but these ducks are different. They live on a grape grower’s land in South Africa. The Vergenoegd Lw Wine Estate is in Stellenbosch. And the ducks are employees of the winemaker. About 500 white, black and brown Indian runner ducks make their home on the grounds. They hunt and eat insects and other animals that can damage grape vines. The birds help protect the plants naturally. This saves the winemaker from having to use poisonous chemicals against such pests in his vineyard.