Bats are one of my favorite animals to deal with.
They are amazing creatures that help keep our bug population sizes down. However, they are the highest transmitters of rabies to humans, so if you see a potentially sick or injured one, then stay far away and call a professional. If you think a bat may have bitten you or someone you know, seek medical help immediately and call the CDC. If you can retain the bat that bit you, that would be helpful to determine if it was infected with rabies.
Because bats often have maternity roosts that they will use throughout the warmer months to raise their young, removing them as quickly as possible is essential to help ensure the colony's size doesn't increase.
I use a low-impact humane netting process on the bats and help the bats be removed safely from the area.
Bats have an insatiable appetite and eat almost half their body weight in bugs per night. Unfortunately, this also means lots of droppings that can grow a fungus that causes a respiratory illness called histoplasmosis, which can be extremely dangerous to humans. An easy way to identify bat vs. mouse droppings is to crush the dropping. If it's hard and almost sticky, then most likely, it's a mouse-dropping. Because bats mainly eat insects, the droppings turn to powder when squeezed. (Please don't squeeze with your bare hands, wear gloves.)