What You Should Know About Bird Migration and Light Pollution
Every year, billions of birds migrate north in the spring and south in the fall, the majority of them flying 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.
Dozens of species are affected, including priority species—those we have identified as most in need of and most likely to benefit from our help— such as the Allen’s Hummingbird, Wood Thrush, and Golden-winged Warbler. Just one building can cause major problems for birds in the area; within one week in 2017, nearly 400 passerines (warblers, grosbeaks, etc.) 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 home owners, 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.
Contribute to Lights Out
- 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 quality and quantity of light needed, avoiding over-lighting with newer, brighter technology.