My procrastination finally paid off. Long after the summer visitors to my hummingbird feeder had departed for their winter home, my feeder hung like a lone beacon in the leafless maple tree. I’ll get around to it, I kept telling myself.     While I was lazily watching out my window a flash of tan caught my eye. Then again. What was it? I knew it was some kind of hummingbird, but why was it here this time of the year?     My bird guide confirmed it was a...