We had 2 of our Musco's sitting on roughy 16 eggs but we started noticing that every once in a while they would push 1 or 2 out. We collected them as they were pushing them out and we would put them straight in the incubator. It came down to them only having 4 under both of them and today when I went out in the morning they had pushed 2 of those out. This afternoon when I went to check on eveybody they were no longer sitting on eggs and I noticed the 2 eggs that were left there were busted up in the run and there was no sing of any ducklings, just severely busted up egg shells. The have been sitting on the eggs for about 29 or 30 days now. What happend and is this normal in any way? We've candled the eggs from the incubator and they appear to be just a few days away from hatching.... We have had a bit of a fox issue in the last few weeks, hanging around the coops, would this have cause this? I am also happy to report that I am 100% possitive that the fox issue is no longer.... Any advice would be good for future hatches, Thanks.