Bats are the only mammals that can fly, which lets them roost in places high off the ground. You may find these bats in sheltered areas such as trees, roof eaves, small wall gaps, and rock crevices. They can squeeze through spaces as small as thirteen millimeters.
In the summer, they gather in colonies where females raise their young. In winter, they hibernate in cool, sheltered spots such as tree hollows or building crevices. After sunset, they leave the roost and forage for insects through the night.
Pipistrelles don’t damage buildings, though their droppings can create some mess. They aren’t aggressive, but like any wild animal, they may bite if they are handled roughly. In many countries, bats and their roosts are protected by law, so it’s an offense to block or disturb them.