Cow birds have taken over my feeders and no other birds will come now. I deterred the adults last year with safflower, nijer seed and peanuts. Now there are tons of baby cow birds and they will eat anything. They sit on the feeders all day and run all others off. I've changed feeders to the ones they are not supposed to be able to get in. It does not work. If I can't do anything else, I'm going to have to stop my backyard birding. Help!