This fall, take a walk in the Garden’s Barbara Brown Nature Reserve and learn to identify birds in their sometimes-confusing fall plumage. Some of the species we will seek include warblers, vireos, and flycatchers, and perhaps ducks, sparrows, and hawks. Dress for the weather; bring binoculars and a field guide if you have them. A map will be sent.  Alan Anderson, Chicago Bird Alliance. Barbara Brown Nature Reserve.