This article from the New York Daily News shows how New York City called in the experts when the rats got out of control!
Feral cats are being caught by volunteers from the NY Feral Cat Initiative, neutered and vaccinated, then sent to areas where they can keep rat populations down. Sometimes just their presence alone is enough to discourage rats from moving in.
“Thanks to the volunteers”, says Rebecca Marshall, a feral cat ’employer’, “We’re protecting wildlife in the city, and the cats get a second chance at life.”
Northland Cats in Balance 