I dont have that problem. I feed the crows away from the ducks. I buy a bag of cat kibble and every day I take a scoop round to the back pasture and shout the crows. Most days they are waiting for me, I just throw the scoop of kibble and walk away, once Im out of their sight they come and get the food. If you get them into a routine and feed them away from the ducks feed they will fill up and not come scavaging because they wont be hungry.
