this is a good as place for this as any. I had no idea
https://www.cbc.ca/news/technology/t...tion-1.4817321
A striking memorial art installation that lights up the night sky in New York City every Sept. 11 temporarily messes with the migrations of hundreds of thousands of songbirds each year.
the lights are shut off for 20 minutes whenever volunteers count more than 1,000 birds in the beams — under an agreement between the local conservation group New York City Audubon and the National September 11 Memorial and Museum, which runs the installation.