Chipmunk Entry Points: How to Seal Holes and Control Populations

A homeowner reports chipmunks getting into walls through an visible exterior entry point and asks for advice.

Expert Answer: First, check your state's wildlife agency for legal control methods. Then consult ICWDM.org for chipmunk control information. After reducing the population, plug the entry hole with newspaper (cork, don't seal permanently). If the newspaper remains undisturbed for 7 days, you can permanently seal the hole. If not, continue trapping and re-plugging until activity stops.