Mice
These little rodents are know to invade our homes for both food and shelter. Highly adaptable to any environment they can cause damage to insulation by building nests or chewing on wires.
In addition to causing structural damage, mice can spread diseases through their droppings or from the parasites they are known to carry. No one should attempt to vacuum up or sweep up mouse droppings. The inhalation of the airborne fungus caused from vacuuming or sweeping up the droppings could be extremely dangerous.