Walking to my office the other morning along South Wacker Drive, I saw a Northern Flicker on the sidewalk in front of the Chicago Mercantile Exchange. Unaccustomed to the sight of dead woodpeckers, I did a little research and learned that migrating birds sometimes smash into the glass windows of skyscrapers, particularly at night. Not all birds die; some of them are just stunned. This Chicago organization is dedicated to helping bird victims of the glass-window aspect of human encroachment on the planet. And it’s looking for volunteers.