We have had at least 3 ducklings hatch under other moms, but the other moms haven't figured out how to properly parent? And the ducklings died. One had food in the crop, the other 2 did not.
But the dead ducklings at least are NOT being eaten or hurt by the moms, just maybe the other moms are failing at feeding, watering, and warming them?
We are trying to watch more closely so if another hatches we can help more.