Sometimes things like this happen and we have no idea why, but most likely for the best, duckling could have had some serious problems.blah... I took mine out as soon as I was sure it was dead, which was pretty obvious because it had stopped moving and the veins were really faint.
And I've heard call ducks can have a hard time hatching. Next time I do duck eggs if they haven't hatched after 24hrs after the due date I'm going to put an air hole in and then cover them in a wet paper towel to help humidity. Go with your gut. If they're still rocking that's a good sign. But if they can't seem to externally pip it's up to you if you want to help. I'm sorry I'm not much help. It is SO hard to know what to do. Good luck and hope you get lots of babies
