Feral Cats Are An Invasive Species in North America (and elsewhere)
10,000 Birds
JULY 22, 2014
This is approximated by the size of the animal, but really, this has to be adjusted for depending on modality of killing. We do know this: In areas where feral cat populations exist, they are often well established. On an island, the feral Cat eats all of those birds. We estimate that free-ranging domestic cats kill 1.4–3.7
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