Today 2 of my ducks died, and i believe it was my fault

[Lor]

How sad. I hope you can figure out what happened.

 

[WingsysRoost]

I'm so sorry for your loss. My first thought would be either some sort of predator like a turtle, or possibly contamination of some kind in the pond (though if the others are showing no issue, I would think that far less likely). I hope you can figure out what happened.