Rats and mice almost always leave signs that can lead to their discovery. There are 3 main species of rats and mice that are of significance in the United States. They are the Roof or tree Rat, the Norway or ground rat, and the House Mouse . Outdoors - Permanent Bait Stations containing Contrac or Talon. Removal of clutter and other debris that may be harbouring rats and mice.
Woodpiles are especially good places for rats and mice to nest.
Seal up any holes larger than a Dime for mice and larger than a Quarter for Rats that may lead into the home or building. Also make sure that door sweeps are in good condition as rats have been known to flatten themselves out in order to squeeze under doorways. Rodent bait used indoors may result in rodents dying inside walls or in attics in which they are unreachable or unremovable. This could result in strong odors resulting from the decaying carcass which could persist for several weeks until the carcass dehydrates. Worth Pest Control.