As hundreds of millions of birds head south, the invisible danger is glass

This dark-eyed junco died after colliding with a building near Union Station in Washington, D.C., on Nov. 8, 2024. The bird was collected and documented by a volunteer with Lights Out DC, a program that has been gathering data on building collisions like this one since 2010.

It's the peak of the fall migration season. This is when bird deaths from window collisions tend to spike, even though simple solutions can prevent this.

(Image credit: Angel Ruszkiewicz)