Cities Are Dimming the Lights to Stop Killing Birds

Every year, an estimated one billion birds die in the U.S. after colliding with brightly lit buildings—especially glass towers that mirror the sky or nearby trees. These crashes aren’t just tragic; they’re a major driver behind North America’s steep bird population decline, with three billion fewer birds today than in the 1970s. As The Guardian‘s Oliver Milman and Aliya Uteuova report, efforts like Lights Out, Texas! are shedding light on the issue—by turning it off.

Dallas, sitting squarely along a major migratory flyway, is one of the deadliest cities for birds. Volunteers with Lights Out scour the streets at dawn, collecting bodies of warblers, doves, sparrows and even rare visitors like lazuli buntings, many of which flew thousands of miles only to die on impact with glass.

Much of the blame lies with excessive light pollution and reflective surfaces. Birds, especially nocturnal migrants, rely on the moon and stars to navigate. When cities flood the sky with artificial light, birds get disoriented and crash. LED lights, although energy-efficient, make matters worse due to their intensity and spread.

But there’s hope. Cities like Chicago and New York have taken steps, like dimming tribute lights and retrofitting deadly buildings with bird-safe glass—alterations that can reduce collisions by up to 90%. In Dallas, landmarks like Reunion Tower now go dark during migration seasons, and campaigners are urging the city’s convention centre to follow suit.

The solutions are simple: turn off lights, install curtains, or use bird-friendly glass. As ecologist Adriaan Dokter told The Guardian, “This is a problem we can solve. We just have to care enough to do it.”

Let’s choose windows that reflect compassion, not confusion. Turn off the lights. Speak up. Help protect the birds that bring so much beauty to our skies.

Video Source: Cornell Lab of Ornithology/Youtube

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