Bats are nocturnal flying mammals that leave their roosts at dusk to feed and return to secluded dark places just before daylight. Most species are active during the warmer months and hibernate and/or migrate for the winter season. However, they do not fly in rainy or unseasonably cold weather.
Bats can pose a serious health threat to humans if they are found inside a structure. Fungi present in bat droppings can cause the lung disease, histoplasmosis. An accumulation of droppings should be professionally decontaminated and removed.
Homeowners should contact a licensed pest professional if an active bat infestation is suspected, as the problem often cannot be controlled with do-it-yourself measures.