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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.

Killing 274
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Feral Cats Are An Invasive Species in North America (and elsewhere)

10,000 Birds

This almost certainly can be argued to be true just on the basis of logic, because feral Cats are proficient hunters and are entirely out of ecological place. 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.