How do I keep large black birds away from my bird feeders?

I have bird feeders in my yard to feed the tiny little birds that fly about, especially this time of year when it’s really cold. The problem I am having is that there are alot of crow / black birds in our area and they are absolutely relentless when it comes to the bird feeders. I really don’t care for these black birds at all. They eat or destroy all the food for the little birds in a short amount of time. Does any one have a sensible solution to this bird problem, besides shooting the black birds. We have plenty of woods and fields for these black birds to hang out in….Not my bird feeders!

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