It's the stuff of nightmares. (SOUNDBITE OF BATS SQUEAKING) KELLY: Bats flying out of their caves by the thousands, sometimes tens of thousands. Across the world, it happens every night. And for the ...

From stains to strange sounds, these are some of the most common signs of bat infestation to look out for if you suspect a ...

KELLY: Bats flying out of their caves by the thousands, sometimes tens of thousands. Across the world, it happens every night. And for the bats, you might think it was a nightmare, too - a traffic ...