Illuminated buildings, especially ones with a lot of glass windows, are deadly for birds. Experts estimate that more than 100 million migrating birds die each year in North America when they become confused by artificial lights at night and fly into the glass.
The campaign urges building owners to switch off unnecessary lights at night during peak migration periods in the spring and fall.
Now in its fifth year, the campaign is having some success. After one federal office building with many large glass windows agreed to their request, volunteers saw a two-thirds reduction in the number of bird fatalities there.
North America News - Lights Out Effort Stops Deadly Bird-Building Collisions