Too keep their large teeth at reasonable lengths, rodents must constantly gnaw. This behavior can lead to the structural damage of homes, as well as increase the risk of electrical shorts and fires. Mice and rats, tear up insulation for their nests, and burrowing rodents damage lawns, fields, and irrigation systems.
Not only do rodents constantly need to chew, but they also breed often. Squirrels breed twice per year with the potential to have almost 20 offspring each year while mice/rats can breed up to 10 times per year and have potential to have well over 100 offspring per year.
Rodents also carry a plethora of diseases, including leptospirosis, Hantavirus, plague, rat-bite fever, salmonellosis, and tularemia. Finally, they contaminate food and gnaw entrance holes in the exterior of buildings, which allows other pests to gain access to homes, as well.