Some of the tallest buildings in Philadelphia will go dark for a few months this year to prevent migratory birds from striking the buildings as they head north.

The participating buildings will shut off the lights from midnight to 6 a.m. every night between April 1 and May 31, and Aug. 15 and Nov. 15 to accommodate dozens of the migratory bird species.

Buildings that have already signed on to the Lights Out Philly initiative include Comcast Technology Center and Comcast Center, Jefferson Center, One South Broad, One Liberty Place, Two Liberty Place, and 1515 Market Street. More than 100 commercial, residential and municipal participants have signed up to turn off or dim their lights during spring and fall migrations.