Free Range Species United States Wildlife 
10,000 Birds
JULY 22, 2014
Also, feral Cats on islands seem to be a serious problem, causing the extirpation of some indigenous species. A hungry feral Cat in Minnesota goes and finds new prey in an area it previously had not explored, leaving the last few of one or another bird species alone for a while. We estimate that free-ranging domestic cats kill 1.4–3.7
10,000 Birds
OCTOBER 25, 2016
Agonizing quandaries concerning invasive species are well-known to wildlife biologists. They argue for the elimination of free-range cats entirely. million metric tons per year in the United States alone; and. (By It’s not just the effect of cats on wildlife that should be alarming, “Cat Wars” says.
10,000 Birds
SEPTEMBER 16, 2014
According to the US Fish and Wildlife Service , there are about 10 billion breeding birds in the US. How many birds to cats kill in the United States? But the US Fish and Wildlife Service estimates between 97 and 976 million a year. Clearly the second choice will cause some species to go extinct, most likely.
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