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Feral Cats Are An Invasive Species in North America (and elsewhere)

10,000 Birds

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. Free-ranging domestic cats have been introduced globally and have contributed to multiple wildlife extinctions on islands. billion birds and 6.9–20.7

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How many birds are killed by windmills and other green energy projects?

10,000 Birds

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.

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