More Than 1,000 Birds Died One Night in Chicago. Will It Happen Again? NYT: Science Amanda Holpuch 18 June 2024 at 09:11 A mass of birds died in Chicago in October after striking one building, adding to the push for more protections in one of the most dangerous cities for avian migration. ยฉ Daryl Coldren/Chicago Field Museum, via Associated PressChicago, Houston and Dallas were named some of the most dangerous cities for migrating birds in an April 2019 study. Experts have suggested a number of improvements to protect birds.