Bird feeders across the US Midwest are abuzz with activity, as different assortments of birds visit throughout the year. In migration, White-crowned Sparrows and Indigo Buntings join residents like Tufted Titmice and American Goldfinches. In all seasons, busy feeding stations serve as living laboratories where observers can peer more closely into the fascinating lives of common species. Attracting a wide variety of birds doesn't happen by accident--the...