Rodents have been responsible for, or implicated in the spread of many diseases in both people and domestic animals. Rats and mice can be found in all areas and all types of homes or business. They are especially active near water such as canals, the beach or on properties with fruit trees.
Besides the obvious "yuck factor". These pests can damage doors, floors, and ceilings with burrowing and gnawing activity. Conservative estimates place the cost of rodent control to be well over 120 million dollars just in the US alone.