May 21, 2025 · American Bird Conservancy

A local ordinance passed in Lake County, Illinois, is taking aim at one of the most worrying threats to declining birds: collisions with glass windows. More than a billion birds die in the U.S. in such collisions annually, contributing to the loss of 3 billion birds from North American populations since 1970. The ordinance is a national first and follows two years of collaboration between Lake County’s Planning, Building and Development Department and American Bird Conservancy (ABC), which commenced after local bird conservation advocate Donnie Dann asked the county to consider adopting a bird-friendly building policy.

Initial conversations centered on how to address bird collisions at County-owned buildings and about adopting a policy for new County construction and collisions at existing buildings. The next step was tackling something no municipality had done before: passing a bird-friendly building ordinance solely for new residential construction, including single-family homes.

“We’re hoping this groundbreaking homeowner collisions requirement could become trendsetting for other cities, especially since our latest study revealed that over 1 billion birds die from window collisions in the U.S. annually, with over 40 percent happening at homes. Together we can build a future in which glass is no longer a leading threat to birds,” said Bryan Lenz, ABC’s Glass Collisions Program Director.