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“Predation, by cats or any other animal, will not reduce the rat population, Dr. Parsons said. Only cleaning up the garbage — the rats’ food — will do that. ‘Rats have a high reproductive rate, and if there’s rubbish around, you’ll have rats no matter what you do,’ he said.”
https://www.nytimes.com/2018/10/12/science/cats-v-rats-in-new-york-the-rats-win.html?action=click&module=Discovery&pgtype=Homepage

Cats v. Rats? In New York, the Rats WinAt a recycling plant in Brooklyn, fat, stealthy rats were more than a match for feral cats, scientists found.