That is what they do. Some chickens are also very fond of snakes and lizards when they show up on the menu.
I always laugh when I see the egg cartons that assure the consumer that the chickens were fed a vegetarian diet - because it indicates that those poor birds never went outdoors in their lives.
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And are the chickens still eating mice or have the eliminated them? Actually chickens eat a lot more gruesome things than mice--their own poop for example--but, hopefully, it is filtered out before it reaches the eggs.