Perhaps I’m heartless. Perhaps I’m a senseless meat-eater. Perhaps I’ve seen a bird fly into a 2-square-foot window, but I think that these guys are off their rocker!

Although cell phone towers, oil spills and power lines raise the ire of conservation groups, those hazards pale in comparison to glass, Klem said. He estimates that only habitat destruction kills more birds.

A friend of mine worked at a store with large plate-glass windows. After a few loud *thwump*s, she gave new instructions to her staff: windows didn’t just need to be clean. They needed to be bird-thwumping clean.