Every spring and fall, billions of birds cross North America. They navigate ancient routes that are now filled with modern obstacles.

Up to one billion birds die each year in the U.S. simply by crashing into buildings.

Birds cannot comprehend glass. They see reflections of clouds or trees and fly straight toward what they believe is open space.

Artificial night lighting disorients nocturnal migrants. The glow pulls them away from natural paths and traps them in urban mazes.

The frequent victims are songbirds, warblers, and thrushes. These species are essential for pollination and seed dispersal.

Declining bird populations weaken forest health. They also disrupt agricultural systems that rely on natural pest management.

Sustainable urban planning now incorporates fritted or patterned glass. This subtle visual cue breaks the deadly illusion of an open sky.

Major cities are implementing policies to dim skyscraper lights during peak migration, drastically reducing fatal collisions.

From commercial high-rises to suburban homes, inexpensive window treatments and decals are proving to save millions of lives.