I got a ceramic duck egg from the feed store the other day and put it in one of the nesting boxes last night before putting them up. This morning when I let them out, I saw the egg had been kicked out of the box. I know it is late in the season, but I was hoping it might encourage them to lay some eggs. Is that normal for the duck to kick the egg out? Should i put it back in? Has anyone used ceramic eggs with any luck?