At least 1,000 birds died from colliding with one Chicago building in one day

McCormick Place, the largest convention center in North America, is largely covered with glass, making it a lethal obstacle for birds

At least 1,000 birds died from colliding into a single building in Chicago on Thursday, 5 October, as they migrated south to their wintering grounds. Volunteers are still recovering bird carcasses within 1.5 miles of McCormick Place, the largest convention center in North America, which is largely covered with glass.

It's the tip of an iceberg but it's it's a huge, huge amount of birds we found both dead and injured," said Annette Prince, director of Chicago Bird Collision Monitors, adding that this was the highest number of bird strikes that the group recorded from the grounds of one building in a single day.