This is the year for two notable, and related, anniversaries. As we observe the 200th birthday of the national anthem of the United States, “The Star-Spangled Banner” by lawyer and amateur poet Francis Scott Key, there’s a second anniversary to remember. It’s a dark stain for our country, but one that few recall in these early decades of the 21st century. It’s the 100th annual observance of the global extinction of the Passenger Pigeon, at one time the most abundant bird in North America, and possibly the world.