The answer to 'rodent damage' is that common causes include gnawing, nesting, and food storage by mice, rats, squirrels, and other rodents. Symptoms include chewed wires, insulation, or wood, as well as droppings and nesting materials. Solutions depend on the extent of the damage, but may include sealing entry points, setting traps, and removing food sources.
For minor damage, homeowners can often address the problem themselves. However, for significant infestations or structural damage, it's best to call a professional pest control technician. They have the expertise and equipment to properly identify the rodents, eliminate the infestation, and prevent future issues.