Last spring when I was migrating through Ashland, Wisconsin, I smashed into this window. I mean, really! Mother never told me there'd be days like this--and no wonder. She never crashed into a window, which is lucky for both of us, since fully half of all birds that collide with windows die. (That's why we avoid Microsoft products, too. We've heard about THOSE crashes.)
If you're a human and live in a building with windows, cover them with screening on the OUTSIDE, or do something else so we can figure out the glass when we're zipping through. Laura Erickson has some suggestions here. Please. Think of the children.