I have heard this sound before in another batch of ducklings & didn't pay much attention, but now I'm interested b/c I might be keeping these two babies. The one that is making the sound is going to be 3 weeks old. I can't really describe the sound, I think it might be a raspy sound as in a drake. I know the difference in sound between the Drake & Hen/Raspy sound & Quack but when their this young does the boy or girl usually make the sound most often? Thanks, ~Julie~ (* )> <( *)