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.
Once under the house, they can almost always find a way up into the walls, via architecture gaps or where holes are cut to allow plumbing pipes through. And yes, rats can enter a house via plumbing and even sewer pipes, and come up through the toilet. Here are four small examples of easy-to-spot rat entry points.