Collision monitoring involves carefully searching for, identifying and counting any birds that have been killed or injured by colliding with buildings in a particular area. Bird-window collision monitoring studies are most often conducted during periods when birds are migrating through an area, especially in urban areas where collisions usually occur most often during migratory periods. But monitoring studies can also be conducted at other times of the year, especially in areas where breeding or wintering bird populations may be at risk. You can help us in this Community Monitoring effort by: (1) looking for birds that have flown into windows around your neighborhood, workplace, and anywhere else you walk near buildings, and (2) reporting information about those birds to Bird Safe Philly in our Bird Safe Philly iNaturalist Project.