Do all you can to keep birds from crashing into a large window! Accidents happen when a bird sees the reflection of their habitat in the glass and try entering through the clearings they perceive. A deterrent, such as the Feather Guard here, helps to prevent that.
This string of brightly colored costume feathers hangs from two suction cups. Its loose, dangling feathers act as a warning sign to birds, indicating a predation incident has taken place. Just stick it to any problem window to keep birds away and safe.