I found this trick online and thought I'd share it. I had lots of trouble with sparrows, the English, also known as the house sparrow, cleaning out my feeder in no time flat. I put weed wacker line on my feeder in several places. I'll be a son of a gun if it didn't work. Most of the other birds it doesn't bother at all. It does give finches a hard time, but they get used to it. Haven't had a sparrow since.