Sometimes Balls will imprint on an animal. We have snakes that will eat anything you toss in the tub, and we have snakes that will only eat ASF. For an animal to imprint means they only recognized the one type of rodent as food. In your case mice. I suggest you return to mice to see if he starts eating again. if he does, then try taking a mouse and rubbing it all over a small rat and see what happens. That gets the mouse scent on the rat and might switch him to rats.
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