Obviously if bats are flying around in your house, that's an indicator you have bats but there are also other signs.
Droppings on the outside of the house or building. They could show up in the corner of an entry way, on the roof under a soffit, stuck to the siding of your home, in the attic, or even under your umbrella on your patio.
Noises such as scratching and or squeaking in your walls or ceilings. In the middle of winter, they can become restless and move around.
Even if it's only one bat one time, they are probably living in the structure somewhere.
ISSUES OF BATS . . .
They are gross! Plain and simple, people are grossed out by having bats in or worse flying around inside of their home or building! Histoplasmosis is a disease you can get from the bat guano (droppings). Especially when it is disturbed and the spores can be inhaled. Mites and ticks can be carried by bats as well as rabies. Although only 1/2 of 1% are carriers of the virus, never handle or touch a bat with your bare skin.
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