...one couple's 25 square-foot balcony is strung with four hanging feeders that lure pine siskins, cardinals, redpolls, blue jays and a half-dozen other kinds of birds. The couple have also put out hummingbird and oriole feeders, and have created a small garden of columbine, lobelia and other flowers, plus red-twig dogwood and other plants that provide food or shelter for wildlife.