I doubt the ducks could get into one of those but I don't know how that could work for moles.Will ducks try to break into those tom cat bait traps for mice?
We have 5 cattle dogs a Jack Russell/border collie mix and a border collie/walker coon hound mix. The JR mix loves to dig up moles, voles and mice. We trade mole and vole runs for ankle busting pot holes in our fields but she sure is tough on those varmints.
I wish I could remember where I read that article. Wasn't a book. Seemed to be a magazine article close as I can remember.