Recently, I had a momma duck kill her ducklings too! I'm thankful for this thread because I had no clue that some first time moms are just bad at it. She had 8 eggs. One hatched and the duckling is healthy. After that, I kept finding open eggs with the shell removed and the duckling within hours of hatching, dead inside the membrane. She was obviously trying to help them hatch. I don't know if she felt the movement, heard the pecking from the inside or both, but these babies were were working their way out of the egg at the point when she was doing this. It was heartbreaking to see that everyday! She had plenty of calcium available.
I finally had to remove the duckling from her because she placed it in the kiddie pool and left it to drown.
Any chance she can be a good duck mom again someday or should I prevent her from becoming broody?
Thanks y'all! Monica