Hierarchy of Threats
Each year, an estimated 1.5 - 2 billion migratory birds are killed across North America as a direct result of human activity. Bird-building collision fatalities are a leading cause of bird death shared with cat attacks, impacts of habitat destruction, agriculture, urban development, climate change, and invasive species. Many birds effected by these issues are species at risk who can ill-afford this additional stress. We can only expect that the numbers of migratory bird deaths will continue to increase as our urban environment continues to grow, unless we all work together to minimize our human footprint.