A building in Chicago's McCormick Place complex caused the deaths of 1,000 birds in one night during migration. To prevent further incidents, $1.2 million was spent on decals designed to make glass more visible to birds. The decals, by Feather Friendly Technologies, use white dots visible to birds but not humans, helping reduce collisions. The effort is part of the "Lights Out Chicago" initiative, aimed at protecting migrating birds by minimizing light pollution. This redesign is expected to save many birds from fatal collisions in the future.