I have nesting boxes about 3 feet from the floor for my hens. I was starting to find an occasional duck egg in the boxes and I tought it was my oldest son find the eggs on the ground and putting them in there. But he said it wasnt him and now it's almost an everyday thing. Does anyone else have ducks that do this? Oh and another quick question. I have green and white(opal) duck eggs. And have a runner and a mallard which belongs to which???