Each year on the evening of September 11th, NYC Bird Alliance staff, board members, and volunteers make their way to the Battery Parking Garage in lower Manhattan, where 88 high-powered spotlights are assembled on top of its roof to create the Tribute in Light Memorial. Throughout the night our team of community science volunteers keep watch, methodically counting the number of birds in the light beams every 20 minutes from 8 p.m. on September 11th to 6 a.m. on September 12th.