Combine an IPM program with a few of these DIY deterrents and repellents, and you can come up with a successful comprehensive plan to get rid of mice naturally. How Poison Works: Most rodenticides on the market today are anti-coagulants.
Rats are rodents that can spread disease, contaminate food and chew up property. Rats burrow in the ground, forming tunnels with one main opening and one or two exits. The 2- to 3-inch wide entrance hole is usually found under a covering like a low plant, mulch or debris. Before closing up burrows, the rats must be eliminated or they will just re-open the holes.
Rats (and mice) can enter buildings: 1  through cracks or holes in walls or foundations, even holes as small as a dime; 2  by digging under house foundations if they are shallow enough; 3  through open windows, doors, sidewalk grates, or vents (check in the basement or walls for vent openings);