Cleaning out the wood duck boxes and replacing the shavings today, Surprised to see out of the 6 I have 5 had 1-4 old eggs not hatched in them. Seems strange, boxes are 100 yards or so apart and in general not visible from the closest box. 1st year in 3 since the boxes have been up I’ve seen activity in them. What’s you guys experience with this, is there something that I need to do differently. Hate to see unhatched eggs.