In an effort to figure out what’s eating the ducks, I put a game camera in my neighbor’s backyard (with their permission, of course).
Did my first pull of the camera contents this morning. Saw a few neighborhood cats, a racoon, there’s a possum that likes hanging out back there, and of course deer. In fact, just a couple of hours ago a doe had hopped their back fence and had breakfast in their backyard. 🙂
But nothing more than that. Obviously no duck-eater yet.
However, these shots made it clear that the smaller critters (not the deer) are in fact crawling under the fence just where we suspected. Can’t close that up until we get to the bottom of this, but once we figure it out that area will need to be sealed off.
Stuff From Hsoi 
Why are you dismissing the raccoon as a duck eater candidate?
That’s your perp right there!
Maybe.
Muscovy ducks are big, and they are perching ducks so they have claws in their feet. I’ve seen them fight.. I wouldn’t want to be on the receiving end of a truly pissed off muscovy (or get caught between 2 males fighting for dominance). They can put up a fight.
Raccoons tend to NOT want a fight…. they want easy prey. One of the mallards? Maybe. duckling? Sure. But when there are all those eggs there, why not take the easy pickin’s of the eggs? None of the eggs were touched either time.
So it’s possible a raccoon, but I’m not convinced. There’s a lot of easy food around here, including neighbors will 100% outdoor cats and dogs thus there’s lots of easily available pet food too.