I got 4 today but tonight I found something strange. I had 2 sister mallards sitting on the same nest of 12 eggs. This had been going on for a week. I have found an egg eaten on two different occasions so far. I went tonight and picked up some oyster shell to give to them in case they were lacking something in their diet. The hen that I thought provided the fertile eggs was not in with her sister any longer. Her head has a lot of feathers missing on the back of it is why I figured she was being mated. Sister Hen has all of her feathers but is sitting tight on the nest. I was shocked to find this as for all week they were so closely incubating these eggs. They might not even be fertile as the ones in the house in the incubator seem not to be. I will keep an eye on the eggs and if she deserts them I will put them in the incubator. Strange I thought.