I agree with the above posts. A single duck makes for a lonely duck which therefore makes for a noisey duck. I have 9 ducks, the females include Pekin, Indian Runner, Swedish, and Rouens. They all quack pretty loud with one of my Rouens being the noisiest. When it becomes dark they are silent until morning. The only time they will quack at night is if they are disturbed, they scare pretty easy. My ducks often sleep in a corner of my garage(odd I know, but they like it in there). I never hear a peep out of them when they are in there.