My chickens make good mousers and it is quite amusing to watch. Once or twice a year I will drag the garden hose to the coop and shove it in a mouse hole (they have caught on to what is going to happen as the birds start running around). I turn it on full and then just wait. Usually with in 2-3 min all the underground is filled and the little buggers start running. The birds will run around like mad chasing and catching them and pecking them. They generally will keep chasing other and dont pay to much attention to the ones they have killed so I pick them up and put them in a bucket and later dump it in the burn pile after I am sure they are done. I dont let them eat them but they get some good exercise chasing them.