https://youtu.be/X6jeLLfLZMY
Our bats, the only mammals capable of flight, eat great numbers of insects but are considered nuisances, when they choose to roost in homes attics. The little brown bat and big brown bat, roost together in large colonies and can spread diseases and damage your home. The bats droppings are called guano and they make a lot of it where they roost. Accumulates of guano may cause ceilings to sag and collapse. Bat guano also stains walls and cultivates the growth of Histoplasmosis. Idyllic hunting sites for bats include open fields, marsh areas, and grasslands where they can freely hunt for insects. Bats have piercing teeth and are skilled at biting when they feel threatened, which increases the risk of rabies. In house attics, bats can be heard rustling or squeaking. Spotting their droppings on home exteriors can indicate a bat infestation. To prevent bats from using your attic, seal up all possible entrances such as dislodged shakes and shingles, windows, gaps in siding, uncovered chimneys, and exposed vents.
https://www.linkedin.com/pulse/deltas-flittermouse-bat-randy-bilesky?published=t
http://www.delta-optimist.com/opinion/blogs/blog-delta-s-flittermouse-the-bat-1.7083567