Signs of Squirrels in Walls Even though they can't be seen, squirrels in walls are far from untraceable. They make noises, cause damage, and leave their droppings behind for others to find. People attempting to detect the presence of squirrels in walls should listen for scratching noises, which may occur at any time since some squirrel species are active during the day while others are nocturnal. Other telltale signs include the presence of chewed holes indicating that squirrels have made their way inside. The pests may also leave scratches or claw marks around vents and other points of entry. Homeowners should pay particular attention to wires and plumbing that lead into the house, as squirrels commonly take advantage of these vulnerable areas. Damage Once inside the walls, squirrels have the ability to cause property damage ranging in severity from minor to potentially hazardous. In addition to gnawing on and chewing holes into structures, the pests can damage the insulation and wiring contained within walls. When squirrels chew on wires, they put the entire home at increased risk of an electrical fire. Prevention & Removal Keeping squirrels out of walls involves limiting their access to homes. Tree limbs should be trimmed back away from roofs, and openings such as chimneys, vents, and gaps under the eaves should be adequately covered. Squirrels in walls should never be removed by hand, as they will bite if they feel cornered or threatened. Furthermore, squirrels are elusive animals and skilled at evading human contact, which can make removal particularly challenging for untrained persons. Critter Control, however, offers safe and effective squirrel removal services.