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Building window collisions kill an estimated 365-988 million birds annually in the US, with some estimates exceeding 1 billion
Source: The Condor / American Bird Conservancy (2024)
Notes
Second-largest human-caused bird mortality after cats
The Condor / American Bird Conservancy. (2024). Bird-building collisions in the United States. As cited in Cat Cognition. https://catcognition.com/statistics/wildlife-impact/#us-bird-window-collisions
1.3-4.0 billion
Free-ranging domestic cats kill an estimated 1.3-4.0 billion birds annually in the United States
Nature Communications (2013)
6.3-22.3 billion
Free-ranging domestic cats kill an estimated 6.3-22.3 billion mammals annually in the United States
Nature Communications (2013)
2.9 billion
North America has lost approximately 2.9 billion breeding birds—a 29% decline—since 1970, according to a landmark study led by the Cornell Lab of Ornithology
Cornell Lab of Ornithology / Science (2019)
2.4 billion
Cat predation is the single largest human-related cause of bird mortality in the US, killing an estimated 2.4 billion birds per year
Nature Communications (2024)
