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The worst day in 40 years of monitoring was blamed on an array of factors, including weather patterns, badly timed rain and lit windows at Lakeside Center.
The birds hit McCormick Place Lakeside Center windows, the result, according to experts, of migration conditions, rain and the hall lights and windows.
The worst day in 40 years of monitoring was blamed on an array of factors, including weather patterns, badly timed rain and lit windows at Lakeside Center.
This isn't just a problem in Chicago. In 2014, research suggested anywhere between 365 million and 988 million birds die in window strikes every year across the US.
At least 960 birds died, crashing into lit windows at McCormick Place Lakeside Center even when monitors collected the casualties, the Chicago Tribune reported.