I am just beginning to feed birds. I thought it would be fun to buy one of those small, clear acrylic feeders with suction cups to put at my kitchen window. In doing so, it took well over a year to get a bird in there!! Honestly it could have been more like two years. I was shocked. I changed the food constantly and never gave up. Early one morning, my husband came and woke me up and said... you have to see something! A beautiful cardinal was in the feeder. Since then, it attracts mainly house wrens, sparrows, and some pesky morning doves that drive all the small birds away. I rarely ever see a cardinal which is disappointing. While I respect all of God's creatures, and know they all have to eat, I'd like to discourage the morning doves because they have taken over. Any suggestions??