Around this time of year, every night, a quiet exodus is occurring. While most humans are brushing their teeth and heading to bed, hundreds of millions of birds are taking to the sky – migrating south for the winter, using the moon and the stars to navigate on a journey that will take them thousands of miles. One of the biggest dangers for these tiny travelers? Glass.

Birds can be drawn to artificial lights – the kind that humans put around buildings. And when they fly down to these buildings to rest and refuel, they often run smack into another feature of those buildings: their glass windows. Researchers estimate that every year in the U. S., collisions with windows take out at least a billion birds. Even if the birds initially fly away, collisions can cause concussions, broken bones, an

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