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

10,000 Birds

He also had tigers, cougars, and some other animals. And for rodents and reptiles as well. This is approximated by the size of the animal, but really, this has to be adjusted for depending on modality of killing. Smaller and larger animals (if there are any) are taken by other creatures. That was one of his cats.

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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 Notably, this is a vey small number compared to the number of rodents killed by the same cats.

Killing 274