Duckling predators will include turtles and fishin the water as well as air and land predators. Call ducks are small enough that they are open to attack from all fronts unfortunately. Be ready and willing to loose them to predation, the, flying off or any number of things if you plan to keep the, housed on a large pond. They chose to not be locked up at night which will make keeping them safe impossible. We house all of ours in raised breeding pens during season and on the ground in flight pens off season.
Currently we are selling off all of our call duck flock, the trios have sold for 100-150 but are SQ proven breeders. Eggs are still collected daily and set in the incubators weekly. Those ducklings who hatch are $25 each and can not be safely shipped as day olds because of their size. They wouldn't be available for shipping until they are 8-12 weeks old.
Not all call ducks are created equal either. Pet quality call ducks won't be the tiny little billed cute ducks you see pictured online. They are still cute, but educate yourself on quality of call ducks available and know what you can expect based on price.
Hodum, Foleys, Jesse Paul to name a few have quality call ducks. There is also a US call duck association where you can read and get good information.
