Louis has incorporated protecting biodiversity into its approach for operational sustainability. In response, Lights Out Heartland, a local initiative in collaboration with the National Audubon Society and the Missouri Chapter of the International Dark-Sky Association, launched to spread the word to encourage residents and businesses alike to limit light pollution, especially during the peak migration months, starting in late April through May for spring migration and the months of September and October for fall migration. Louis ranks among the top 5 of the worst cities for migrating birds.

Exhaustion makes them more vulnerable to other threats, like predators or flying into glass buildings, which are also abundant in cities. Light pollution from cities disorients birds, drawing them into the glow and causing them to waste valuable energy, often trapping them in a circle until dawn. Louis pose a disproportionate risk to birds, as the geography, developmental spread and glow of night time lights converge to create significant obstacles to these long-distance travelers.Ĩ0% of migrating birds migrate at night, using the moon and stars to navigate. And each year, these birds are among the 600,000 birds that die after colliding with buildings.

Each year, billions of birds pass through the United States on their way to seasonal destinations.

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