I’m having quite the problem this year with Common Grackles stealing all of the bird seed from the feeders and keeping the other birds away. I can’t be around all of the time and I can’t be constantly chasing them off. First, I did some research and found that they were some pretty smart birds. Second, I’d be chasing everything away. Last, I can’t be here and keep watch all the time.
A little Google research suggests that they don’t like shiny things that move about. I’ve got this big stack of empty CD/RW disks so what does it hurt putting a couple out? The chickadees and finches don’t seem to mind them so far. Hopefully the cardinals will be OK with them too. If not, they’ll come off in the Fall when most, including my nuisance bird, fly south for the winter.