The side porch of our home in northern Calvert County faces east. It’s a great place to have our morning coffee and feel the first warm rays of the sun. It’s also where my wife sets out the hummingbird feeders, so we get to watch the high-speed high jinks of these delicate little birds.     As our birds return from Mexico, each year one or two hovers around the very spot where the feeders hang, peeking through the screen as if to say, Okay, I’m back. I know you...