Birds don’t see glass. They perceive windows as passageways to fly through or as habitat to fly into when windows mirror the sky and trees behind them. Birds typically die after colliding with windows and collisions are a major cause of avian mortality worldwide.
Collisions with windows are the third greatest cause of death for birds in the United States, after habitat loss and predation by outdoor cats. Peer-reviewed conservative research estimates that about one million birds collide with windows every day—the annual estimate is 365 to 988 million.
To learn about this threat and how to help mitigate it at your home, join Dennis Riordan, for a presentation of Bird-Window Collisions, developed by the Pennsylvania-based Bird-Window Collision Working Group that includes the Acopian Center at Muhlenberg College and Audubon Pennsylvania.