There are really lots of brats around. Like what they have done to your ducks, they don't care what will be the result of what they are doing. And especially they will never you how hurt you will be seeing your ducks like that. My advice is that you try to talk to the parents of the 2 children and explain to them what they have done. And also, in order to prevent that same thing will happen, try to make a house for your ducks which is closer to your house so that you will be able to see your ducks more often. Hope that helps.