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“Cats are an invasive species,” says Cherkassky, who monitors TNR activity around the country. “They aren’t native, and they kill not just to eat, they kill for sport.”
Smithsonian scientist Marra says feral cats are “a major threat to birds,” responsible for the extinction of 30-35 island bird species around the globe. The American Bird Conservancy says cats rival window strikes as the top killer of birds.