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.
House Digest on MSN
7 signs that bats are living in your home (and what you can do about it)
Wondering if you may have a bat infestation in your attic? These are the signs to look for -- and methods for getting them ...
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