hi Guys: Crows have begun their visits to my bubbler fountain, bringing food, bread, peanuts etc, they are not only gunking it up, but im also wondering if they are scaring my other birds away! My hummingbirds still visit, but i have not seen my Goldfinches visiting in months ( unless they are seasonal, here in Southern California)? Do crows scare other birds away? lf so how to prevent crows from visiting ( not that they should not drink but they are not desired if they do scare my other birds away)