The main signs of a bat infestation are piles of rice grain-sized droppings and dark urine stains. Ammonia smells, scratching and squeaking at night, or bats around your yard are also common signs.

Ben Sciortino, owner and president of Tri-S Pest Control Service, says that a lot of homeowners think the odd noises coming from the attic are coming from mice or rats, but when they listen a little ...