Philly to dim lights to make it safer for birds in flight SHAWN MARSH, Associated Press FacebookTwitterEmail 2 1of2FILE - In this Nov. 14, 2016 file photo a supermoon sets behind the Philadelphia skyline. Bird Safe Philly announced on Thursday, March 11, 2021, that Philadelphia is joining the national Lights Out initiative, a voluntary program in which as many external and internal lights in buildings are turned off or dimmed at night during the spring and fall bird migration seasons. Millions of birds annually migrate through Philadelphia during spring and fall and many are killed when they fly into buildings, confused by the bright artificial lights and glassJoseph Kaczmarek/APShow MoreShow Less