
We had this trouble so I made my own feeders from fat and seed in small pots and tied these to the spindly branches that the crows were to big for. I use ordinary seed feeders too and put those on slight branches and this seems to stop them. The little birds dont seem affected.
I did make the Crows some big ones and tie these to the branches, but they are sooo greedy I couldn't keep up with the demand or amount of visitors I was getting!