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

10,000 Birds

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. Here we conduct a systematic review and quantitatively estimate mortality caused by cats in the United States.

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Are there so many birds that cats don’t matter?

10,000 Birds

For instance, assume (and I will NOT stand by this number, it is just one I’ve heard here and there) that kitty cats in America kill 50,000,000 birds a year. Hardly any Sandhill Cranes are killed by domestic (including ferrel domestic) cats. In fact, there are certainly a few cats killed by hawks every year.

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