Why are open windows a risk factor for bat entry into buildings?

Open windows pose a risk factor for bat entry into buildings primarily because they provide easy access points. Bats are agile creatures capable of flying and maneuvering through small openings. An open window allows them to enter a building freely in search of shelter, food, or a roosting location.

While factors such as the environment created by open windows, like warmth or the presence of insects, can attract bats, the direct aspect making them a risk factor is the physical entry route that open windows afford, making it simple for bats to venture inside without any barriers. This highlights the importance of closing windows, especially in areas known for bat activity, to prevent unintended entry.