HARRISBURG, Pa., Jan. 22, 2013 /PRNewswire-USNewswire/ -- If you are interested in connecting with wildlife in your own backyard, beginning Monday, Jan. 28, the Pennsylvania Game Commission will be selling bluebird nesting boxes at its Harrisburg headquarters at 2001 Elmerton Avenue. The boxes sell for $10.60 (includes sales tax), and customers can select from assembled boxes or kits that can be assembled as a wood-working project. "Bluebirds are early nesters, so now is the time to put up new nest boxes, as well as to clean and repair existing boxes," said Dan Brauning, Game Commission Wildlife Diversity Division chief. "These bluebird boxes enable Pennsylvanians to help wildlife in a natural way. "Also, building nesting boxes is a great project for individuals, families or civic organizations interested in connecting with wildlife. These box designs are proven to attract bluebirds and other native species, such as tree swallows and house wrens." Bluebirds live in open country, and are a beautiful songbird native to Pennsylvania. Bluebirds are cavity nesters and became less common due to a lack of suitable nest sites. Many nest sites have been lost through changing land-use practices, as well as to urban and suburban sprawl. But the introductions of house sparrows and starlings in 1851 and 1890 were the primary reasons for the bluebirds' decline, as these non-native species took over native bluebird nesting cavities. The bluebird boxes offered by the Game Commission include an opening that is the prescribed one-and-one-half inches in diameter. This precludes starlings from being able to enter. However, house sparrows still are able to enter the boxes. If this occurs, the house sparrow nest should be removed immediately. They're usually easy to identify; they fill up the whole nesting cavity with grasses and almost always include feathers and manmade materials in their composition. Native species such as tree swallows and house wrens should not be excluded from nest-boxes. Wrens construct nests with twigs; swallows build a nest with a distinct cup below the entrance hole.