I have had a bird feeder for almost a year. It took a long time for the birds to discover and trust it. I clean it and change the feed as it does get moldy if no one eats it. I suddenly got beautiful cardinals visiting. Many of them early morning and evening. I was thrilled then suddenly the red wing blackbirds and regular blackbirds started coming. I understand that they need to eat too but they are driving my cardinals away and emptying my feeder in one day. I took the feeder down and the blackbirds have started to leave but not without squealing for days. My cardinals come to visit but unfortunately my feeder is gone. Is there anything I can do to just attract non pesty wild birds.

HELP