I have 8 month old rouen ducks, that have shown interest in our drakes. I have caught one pair trying to breed in the water dish, and seen them breed several times last fall/summer in our pond, but have not yet seen a single egg from them. Is this normal???? Also do they need water to breed in to have fertile eggs? Since my pond is frozen soild, and my water dish isn't really big enough to get the deed done.