I know I'm late to the party but YES! Training your ducks to come when called is the best thing ever. I decided one day to start, and all I did was call "duckies!" and then throw some corn where they could see it. Positive reinforcement! Now when I call "duckies!" they come running (half flying lol) and stand at my feet waiting for corn. It's the best! And also great when guests come over. Also, my ducks usually only listen to the voice of people they know. I guess it does depend on the tone. I've had people call "duckies" over and over again and not get so much as a quack. However, if I so much as say "duckies", they all look at me!