They're pests aren't they! I suspect I have the same problem, just haven't caught them yet.
The only thing I can think of is, if you surround the feeders with mesh big enough for the small birds to get through but not the crows heads. Or you could make entry points big enough for the little ones. I will have to make something like this for one of my feeders to keep the doves out.
Caged food seems a little odd....lol
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