House sparrows are neither a song bird nor protected but are considered to be a pest species. They can have up to four clutches per year of several eggs each. They are small, weighing only about one ounce which enables them to nest in the small crevices of your home including behind the window shutters. Besides the noise and mess there is danger associated the diseases carried by all wild birds. Parasites, fowl mites, toxoplasmosis, histoplasmosis, West Nile Virus and salmonella are all found in wild birds and their droppings. Also, bat droppings below shutters are a give away that bats are roosting behind the shutters. Window shutter exclusion is an important strategy in dealing with house sparrows or bats. Once the creatures are removed, the void between the back of the shutters and the siding is filled with “critter guard.” It is hardly noticeable and prevents further invasion by birds or bats which also like to find refuge behind shutters. Shutter exclusion can be done almost any time of the year. To learn more give us a call at 610-385-4405. Shutter Exclusion for Birds & Bats Shutter Exclusion is hardly noticeable. Shutter exclusion looks more like a shadow. You have to look closely to see it. It fills every nook and cranny behind the shutter.