Lately, I’ve been writing a lot about birds. I guess I have them on my mind, in part, because the spring migration season is underway. I heard my first Louisiana waterthrush (a warbler) of the year this past Sunday morning. But then again, birds are always on my mind summer, fall, and winter, too. And I’m not alone. Each week that I write about birds, I receive at least 10 emails from readers who share their bird observations and insights with me. Here we go again.