With plenty of available food and a mild climate, St. Louis, MO, is the perfect place for bats most of the year. However, because there are few insects around in the winter for a bat to eat, many migrate to warmer areas. Others choose to stay and hibernate inside buildings.
While the pests may make some scratching noises, most bat sounds are outside the human range of hearing. Homeowners are unlikely to hear these animals in the wall voids or attics where they roost.
This can be a problem, as infestations are dangerous. Bats in St. Louis can transmit rabies through their bites or the disease histoplasmosis via their waste.