that is one thing I am not looking forward to seeing, we have a lot of field mice and small rodents (moles/voles) around here. Fact of life is fowl love rodents. We have loads of wild grouse and partridge and quail. I have seen a few partridge run into the bush once or twice with a rodent in their mouth...lol...
Ewwww, I had no idea ducks and chickens would eat rodents!! A pekin can really swallow a mouse?! Good to know, I'm sure it will happen with mine eventually. My chickens and pekins are about 3 months old, the other day I let them out to free range and the chickens were pecking at something on the ground, it was a dead baby bird that fell out of a nest.
I couldn't bear to let them pick it apart so I threw it away. But if they want to eat mice that's fine with me....I just don't want to see it.