If you are hearing scratching in your walls or fluttering late at night you probably have bats in your attic. The species of bats in Michigan are dwelling bats.  This means that they roost in caves or similar structures. Your attic is an ideal place that has an abundance of places to keep warm and be high up and away from predators. Bats in Michigan live in colonies which can mean if left unchecked your attic can contain large numbers of them living together. Bat removal in Michigan will depend on finding all of the entry points in your attic and sealing them. One way doors will be installed to allow the bats to leave but not come back in.