Since this is about the tenth iteration of this subject:
The Wisconsin wildlife agency got a bunch of wildlife biology grad students to do research on feral cats. Quick summary: A feral cat will kill about 100 songbirds in a year. The population of feral cats in the state of Wisconsin was estimated at around a million. I do not see the math as being a challenge.
A next-door neighbor here in south Georgia--rural area--regularly put out a small bowl of cat food for the kitties. We ran out of songbirds, squirrels and rabbits. The animal shelter folks came out with a Havahart trap, and in a period of a couple of months captured 72 housecats. That ended the feeding and we now have some songbirds and squirrels.
Feral cats = fuzzy cockroaches. Just as desirable as a screw-worm fly.
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