@1kluckychik Ducks, mallards or muscovy, because both can fly good to evade predators.
Geese, Cotton Patch, for one they are the only domestic goose breed that can fly from a standstill and are great at evading predators, and they are supposed to be super friendly, for two they are super rare and hard to come by and you can send me eggs :-D and I bet you can make good $ off them.
Our pond (it's not there anymore sets on the bank) had a long metal pole with a concrete base and metal platform on top, yrs ago it sat in the middle of the pond with a duck house on it. I imagine if your ponds too deep to do this you could build a floating one attached to a chain or cable. Keeps most land predators from getting to them, won't stop ones that swim though.
Not like wood duck boxes, they are like birdhouses way above the water with a cone around the pole, keeps all predators out.
Domestic ducks need a dog house like house, just barely above the water.
I fed mine cheap dog food cause it floated, not sure if that's ok or not, they lived fine on it. Figured it's mainly corn and 18% protein, might be more fat than they need. You should have seen the bass that ate it also HUGE!