Video: Can We Stop Millions of Birds From Crashing Into Windows?

Every year, up to a billion birds are killed in the U.S. when they strike windows.

In New York City alone, an estimated 90,000 birds die after crashing into high-rise windows, especially during migration seasons.

Efforts are under way now in New York to design windows that could save the lives of avian travelers.

This video was first published by National Geographic on 22 Dec 2014.