Why do people want their ducks in a row?

When you go duck hunting it is best to have the ducks fly in your direction or sitting on the water, in a row. It makes it easier to actually shoot them. The phrase has been adapted to apply to any situation where multiple things need to be set up whether it's in business, family or in your personal life. Usually said when you are in the process of getting things together. Putting your ducks in a row.