When migratory birds fly through populated areas at night, buildings with lights on can cause them to become disoriented. And birds don’t see clear glass windows as an obstacle. Instead, they often see the reflection of trees and shrubs and think they’re flying to safety. Every year, up to a billion birds die when they collide with buildings, including many low-rise buildings and houses. Fortunately, there’s a lot that can be done to prevent birds from striking windows.

More info and transcript at BirdNote.org. 

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