I agree with Debbi...its a good thing to attract crows. I also have a feeding platform,don't feed corn but food scrapes.
The crows are usually around to check out any new goodies i may have put out.This is my 4th yr with hens, no hawk losses yet. I have resident redtails and have seen other hawks around.My girls range on my 1 1/2 acre property, which provides a milion hiding places.Over the yrs i have planted evergreens completley around my land. When i say they have a million places to hide when hawk is near, i mean it...!
Lots of cover and crows have worked for me.Chickens out in the open, no crows around and hawks= trouble ...
I would never put baby chicks out on range, so crows aren't a problem that way, an they haven't tried stealing eggs from the hen house ,nor feed...good luck....provide lots of cover...