Yes they do.
pecans
Yes they will kill and eat adult ducks and geese too. They can run really fast and will corner out a victim and kill them.
No owl in North America eats adult ducks. Great Horned Owls may attack ducks in flight but this appears territorial. Owls can attack and eat ducklings.
They use to but i convinced them to change to pecan pie and now they eat that exclusively.
Yes, runny pecan pie is safe to eat, although it is fattening.
No. Ducks are generally not considered carnivores, meat eaters. They don't have the beaks for it. Even if they had, an adult beaver would be a difficult prey for a bird of a duck's size.
yes ducks do eat meat
Yes, ducks eat bugs.
Yes ducks can eat grapes!
no
If the fish are tiny yes they will eat them. They can eat a fish as big as a feeder goldfish!