My brother has a pail (like a 5 gallon bucket of paint) half filled with water and straw. The straw is to camouflage the water. The mouse strolls into it and then can't get out. I searched "mice" on this website and found something similar. It's the same pail, but with a wire stretched across through a coke can that has a bit of peanut butter or something sticky to attract the mice. It appears that the can will roll and mouse will fall into the bucket. The link that goes with it is no longer there. I printed the picture and told my husband to show it to my brother when he finds that there are no mice in his bucket! Both these gentlemen are retired. I'm the only one working these days!
Thanks for the input, all. I'm hoping to report soon that mice are gone and egg production is back to normal. Oh, by the way, in my "mice" search, I found a pic of a chicken with a mouse in her beak. I think all my girls prefer dead stuff. Some of them, but not all, like worms!