I am so sorry! Let’s see if others may know what this could be. @MasterOfClucker @Jpat yes get someone to help and walk slow behind using your arms to guide them where you want them to go. It will take some doing but eventually they’ll not be so hard to herd.
I will take a wild guess an say yes the predator will be back. Herd them ducks inside they may not like it but they will still be alive in the morning. What did the bodies look like when you found them maybe we can figure out what predator your dealing with.
If the other two are healthy and they are all the same age, it’s a good chance that is a drake although I’ve never had a duckling stick out at that age as a drake. They are sure pretty little things:love