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. 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.
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