Free Range Protection Species Wildlife 
10,000 Birds
SEPTEMBER 16, 2014
According to the US Fish and Wildlife Service , there are about 10 billion breeding birds in the US. A recent meta study ( The impact of free-ranging domestic cats on wildlife of the United States ) that applied strict inclusion criteria and some fancy statistics estimates that 2.4 So keep that in mind.
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
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