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.
Ground squirrels dig holes, of course, and they are easy to spot, as are gopher holes and mole holes, with the dirt piled around the entrances. Moles tend to have their entrances in the center of the excavated dirt, so it looks like a volcano, while gopher holes are eccentric.