take one of your ducks in - I bet they eat them!
Quote <Muscovies love to eat flies, maggots, mosquitos, mosquito larva, slugs, bugs of all sorts, black widow spiders, the brown fiddleback spider and any thing else that creeps and crawls. As a matter of fact, they will search in, under, around and through places to find these tasty morsels. They will even eat ants and destroy ant dens. >
Just make sue they are not importet fire ants.