Remove Cat Population Remove Killing Remove Otters
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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. You can make a similar map for the small carnivores, the Mustelids, such as minks, ermines, otters, etc. We do know this: In areas where feral cat populations exist, they are often well established.