If you have room for only one shrub, make it Bayberry. A wildlife playground. Extremely versatile, evergreen, dioecious shrubs can be used as a specimen, screen, or trim as a hedge.
Wildlife interaction: berries feed numerous species including Bluebirds, warblers, bobwhites and wild turkey. It is a host plant for countless moth caterpillars which in turn provide food for native wasps and bees. Cover and nesting site for many species as well.
Flowers attract bees and other pollinators. added bonus? cull the wax from the berries to make candles!
Learn more: http://www.fs.fed.us/database/feis/plants/shrub/myrcer/all.html