Add Yahoo as a preferred source to see more of our stories on Google. tillsonburg/E+/Getty Images If you hear scrabbling in the attic, that's a strong indication you have squirrels. Other signs ...

If you hear scrabbling in the attic, that's a strong indication you have squirrels. Other signs include a stash of acorns or nuts, nesting in the insulation, a strong smell of urine, chirping babies, ...