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Cat Wars: The Devastating Consequences of a Cuddly Killer

10,000 Birds

They argue for the elimination of free-range cats entirely. pets) that roam out-of-doors; At least 500 milllion birds are killed by cats each year (but the number is probably higher, maybe twice that or more); Cat feces, via which a dangerous parasite is distributed, amount to 1.2

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

10,000 Birds

An abstract from a recent paper in Nature : Anthropogenic threats, such as collisions with man-made structures, vehicles, poisoning and predation by domestic pets, combine to kill billions of wildlife annually. Free-ranging domestic cats have been introduced globally and have contributed to multiple wildlife extinctions on islands.