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Domestic cats are responsible for the extinction of numerous mammals, reptiles, and at least 33 bird species globally.8 A study published in 2013 estimated between 1.4–3.7 billion birds and 6.9–20.7 billion mammals are killed annually in the U.S. by feral and free ranging domestic cats, making them the largest human-influenced source of mortality for birds and mammals in the country.
> Domestic cats are responsible for the extinction of numerous mammals, reptiles, and at least 33 bird species globally.8 A study published in 2013 estimated between 1.4–3.7 billion birds and 6.9–20.7 billion mammals are killed annually in the U.S. by feral and free ranging domestic cats, making them the largest human-influenced source of mortality for birds and mammals in the country.