For two years now I have let my ducks sit their nests. At no time have they ever hatched any eggs. Last year, they got close. I actually found 3 shattered eggs with what looked like perfectly formed ducks in the pen. One was still breathing and I tried to hatch it, but it died hours later. This year, I let the girls have a nest. And they sit. They sit and they sit. They are GREAT brooders. . Sometimes as many as 3 of them will sit in on the nest and yet, no ducklings. They are sucky hatchers I have had better luck incubating and hatching eggs than the mommas!!! What are they doing wrong????