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

10,000 Birds

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. They are invasive species.

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

10,000 Birds

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 About 15 million birds are killed annually by hunters, and of course this is distributed among a very small number of species.

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