Second only to habitat loss, predation by domestic cats is the most important direct, human-caused threat to birds in the United States and Canada.
In the United States and Canada, free-roaming cats are the top source of direct, human-caused bird mortality. Free-roaming cats kill an estimated 2.4 billion birds and 12.3 billion small mammals every year in the United States alone. Although this number may seem unbelievable, it represents the combined impact of tens of millions of outdoor cats, including feral cats as well as those owned but kept outdoors. Outdoor cats also kill millions of frogs, lizards, and oher wildlife each year. The magnitude of this level of wildlife mortality by an introduced predator has contributed to significant conservation impacts. Learn more about this problem here.
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