I came across this video showing thousands of migratory birds circling the Tribute in Lights yesterday. The birds were migrating along the Atlantic Flyway and were disoriented by the lights. Other birds may have been attracted to the large number of insects and smaller birds caught up in the lights as prey (Cornell Lab of Ornithology). To reportedly help re-orient the birds and prevent exhaustion, volunteers from the NYC Audubon turned off the spotlights temporarily.
Video taken by: Shervin Pishevar
The lights are xenon searchlights in lower Manhattan arranged by artist Gustavo Bonevardi to resemble the twin towers as a tribute to the victims of 9/11.