If you've spent a lot of time observing bird feeders in the US Southeast, then you're intimately aware of the unique insights that can be gained by watching the busy comings and goings of common visitors like Painted Buntings, Northern Cardinals, American Goldfinches, Brown-headed Nuthatches, and Red-bellied Woodpeckers. Especially during migration when standouts like Indigo Buntings and Baltimore Orioles pass through, feeder-watching is a endlessly...