Good point about the steel wool and caulking. Mice are destructive. They do not need food sources (if you have everything in sealed…more »Good point about the steel wool and caulking. Mice are destructive. They do not need food sources (if you have everything in sealed containers), they will just chew up the wood in your home for food as they make their nests. Note: mice (pets or wild) carry diseases which are harmful to humans and pets. http://www.cdc.gov/rodents/diseases/direct_rodents.htm
They also carry fleas and mites that can trigger asthma symptoms in some people. In cases of severe infestation, glue traps may be your only way of bringing the problem under control. I used three rat sized traps, placed in line with the travel line (usually a dirty/greasy line around baseboards and entry/exit points) and overnight caught the entire family (37 mice total). Now, snap traps catch the occasional intruder and the visible signs (grease trails, droppings, etc) have virtually disappeared.
I have yet to hear of any useful purpose for vermin. « less