City rat fighters have largely stopped using anti-coagulants that kill not only rats, but any wild predators and pets that might eat them and is instead now relying on relying on pumping carbon monoxide and carbon dioxide into burrows to asphyxiate them, according to John Ulrich, who oversees ISD's rat control efforts. Read more.
Jesus told me that rat abstinence is the only option.
That’s how you end up with rat bastards.