Houdini ( my dog ) was tunneling into the earth of my chicken pen this morning so I went to investigate, and what do I find...BABY MICE. Most where already dead. The hole that Houdini had dug revealed bits of straw and dry leaves. I can only assume that there are a system of tunnels running through my chicken run. I have a sectioned off area in the run( trying to grow some vegetation ) which is now rather overgrown which I think is where the tunnels would mostly be. The hole my dog found is right near the sectioned off area. Ok, how do I get rid of the little buggers??? We have some ratsak ( rat poison ) which I was going to put in the sectioned of area and I also have some sump oil ( old engine oil ) that I was going to poor down the hole. Will any of this work in sending them on their way? What about a fire?? Any help appreciated.