What breed of chickens kill mice?? Gotta get me a couple of them!
My chicken killer is a Speckled Sussex...whether she has or will do it again, who knows. Probably any of the heavy breeds are capable of killing mice...whether they'll do it or not is another question. Mice are mostly nocturnal, that presents a problem...
I have a live trap called a tin cat. I put it in the coop and caught 12 mice one night, 8 the next, 6 the next. None after that 3 days in a row and so I stopped setting it. (I was afraid to set snap traps that the curious chickens could access even if I tried to block them.)