Cat Population Eggs Killing Species 
10,000 Birds
OCTOBER 16, 2012
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.
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. Also, feral Cats on islands seem to be a serious problem, causing the extirpation of some indigenous species.
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