I accidentally created monsters by feeding a pair of American Crows. At first, all was well and they were content getting the occasional treat of meal worms, cheese, baked chicken scraps, and other healty tidbits. Now, the crows boldly steal food from our ducks' food bowl, chase the ducks when the ducks are foraging for worms/bugs, and steal any duck eggs laid outside of the duck house. It's my fault for welcoming and feeding the crows in the first place, so I feel bad completely cutting them off; however, they're becoming a nuisance. Any ideas for how to keep the crows away without scaring our ducks?