A Double-crested Cormorant perches in a tree at night, silhouetted by moonlit clouds.
A Double-crested Cormorant perches in a tree at night, silhouetted by moonlit clouds.
Bird-Friendly Communities 2020

Lights Out

Save migratory birds by turning off outdoor lights.
Double-crested Cormorant. Photo: Attiana Cogswell/Audubon Photography Awards
Double-crested Cormorant. Photo: Attiana Cogswell/Audubon Photography Awards
Save migratory birds by turning off outdoor lights.

Every year in North America, more than 3.5 billion birds move north in the spring and 4 billion birds fly south in the fall. More than 80 percent of them travel at night, navigating with the night sky. However, as they pass over big cities on their way they can become disoriented by bright artificial lights and skyglow, often causing them to collide with buildings or windows. While lights can throw birds off their migration paths, bird fatalities are more directly caused by the amount of energy the birds waste flying around and calling out in confusion. The exhaustion can then leave them vulnerable to other urban threats and deplete their energy needed for surviving migration and producing chicks in subsequent breeding seasons.

Light pollution affects dozens of species, including priority species—those we have identified as most in need of and most likely to benefit from our help— such as the Burrowing Owl, Yellow-billed Cuckoo, and Grasshopper Sparrow. Just one building can cause major problems for birds. For example, within one week in 2017, nearly 400 songbirds were caught in the floodlights of a 32-story Texas skyscraper and killed via window collisions.

Audubon’s Lights Out program is a national effort to reduce this problem. The strategy is simple: by convincing building owners and managers to turn off excess lighting during the months migrating birds are flying overhead, we help to provide them safe passage between their nesting and wintering grounds.

Here are ways you can contribute to the Lights Out solution:

  • Turn off exterior decorative lighting
  • Extinguish pot and flood-lights
  • Substitute strobe lighting wherever possible
  • Reduce atrium lighting wherever possible
  • Turn off interior lighting especially on higher stories
  • Substitute task and area lighting for workers staying late or pull window coverings
  • Down-shield exterior lighting to eliminate horizontal glare and all light directed upward
  • Install automatic motion sensors and controls wherever possible
  • When converting to new lighting assess the quality and quantity of light needed, avoiding over-lighting with newer, brighter technology
Denver's 16th Street Mall lit at night.
Denver's 16th Street Mall. Photo: Geoff Livingston/Flickr (CC BY-SA 2.0)

Turning off bright lights across the Front Range and Wasatch Front helps birds move on within minutes, as discovered by the Cornell Lab of Ornithology and New York City Audubon during the annual 9/11 memorial in New York City. Hundreds of birds are caught in the memorial’s beams every year but turning them off for just 20 to 30 minutes at a time greatly reduces the density of birds in the area.

Taking more steps to decrease the amount of light our buildings emit minimizes unnecessary bird deaths, prioritizes human safety, saves money by reducing energy consumption, and supports your or your organization’s sustainability goals. Moreover, taking these kinds of initiatives to protect birds can even earn you recognition for green, bird-friendly practices.

Explore the existing Lights Out programs taking place in Audubon’s chapters across the country.

Priority Birds

   

Articles and Resources

Artificial Lighting May Shift Bird Migration by More Than a Week, New Research Says
Lights Out

Artificial Lighting May Shift Bird Migration by More Than a Week, New Research Says

Purple Martins exposed to bright nighttime light migrated eight days early—which could lead to starvation at their breeding grounds.

The Bipartisan Partnership Behind the Bird-Safe Building Act
Lights Out

The Bipartisan Partnership Behind the Bird-Safe Building Act

The Federal Bird-Safe Buildings Act was just introduced—here’s what the Republican and Democratic co-sponsors have to say about it.

How you can help, right now