Thank you so much for your responses. Here are a few things I learned. 

Some said they have been known to eat squirrels.  As a predator, if an
opportunity is there it will take it.  (Where we placed the corn is pretty
wide open)  Also, rats are hunted by the younger ones as an easy prey
before they go after birds.  It is amazing to me how strong hawks are for
as little as they weigh. One had said they saw a Goshawk take a rabbit, so
a good sized Cooper's could take a rat.

I had been hoping with the hawks we've seen around recently, that they'd
do something about the rats. I just didn't realize it would be a Cooper's.
   Between the bird feeders and the duck coop where their food is kept,
the rats have an easy food source.

Thank you again. :)

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