The largest and most comprehensive study of bird collision deaths ever finds that nearly 1 billion birds die in building crashes every year, a shocking number that has fans of the feather creatures urging construction companies to use new materials to stop the annihilation.

The mortality study from over 92,000 records found that between 365 million and 988 million birds crash and die in the United States. The number easily climbs over 1 billion when reports from Canada are included.