katiebrock
Songster
I have also lost two sets of ducks in years past shortly after I got them just because we let them wander when they were too small. This is my first year actually keeping them alive past their first molt!You are not a horrible duck mom or you wouldn't be worried about your remaining duck. I would be surprised if the vast majority of the folks on this forum haven't lost a bird that they feel responsible for. I know I have -- and more than one. ONCE, I forgot to close the coop door and three hens died. ONCE, I let my ducks wander into the back of the property and a drake died.
I am very sorry for your loss. But, don't beat yourself up too much, just do your best for your surviving duck.