My ducks quack all night long. I would think instincts should tell them to be quiet because of predators. We do have two Great Pyrenees that walk the fence line all night barking and keeping the predators out. I don't know if they are disturbing the ducks or if it is normal for ducks to quack at night?? The ducks are around the Pyrs during the day so it's not like they are afraid of them.