Just thought I would tell everyone, I have 7 duck eggs under a broody chicken, they have been under her for exactly 20 days. I'm guessing they will hatch from September 6th to the 11th. They are khaki campbell ducklings. This is my first time hatching ducks so anything I should know? I know it's a little late for help. I have candled all of them and I discarded a few that weren't growing or infertile. They just started turning pitch black, which I know happens from day 17-20. They all have veins, I am pretty excited!