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.
Vole holes may be even as small as a dime. Bigger holes, about 2 to 3 inches in diameter, may indicate rats, especially if those holes are near trash, water, woodpiles or buildings. Muskrats dwell in 4-inch-wide burrows near water sources.