Super-rats immune to poison 'growing as big as cats

Pest controllers in Liverpool claim rats are growing as big as cats and have called on the Health and Safety Executive to allow them to use more deadly poison

How do people kill rats that have very large sizes? I have tried with rat poison mixed into food but the rat always eats it and the rat doesn't die either.

The expansion of super rats… – Combirepel Non Toxic Non hazardous animal, rodent and insect repellant

Pest advice for controlling Rats

Killing 'super rats' with vitamins

Are Rats Becoming Resistant to Poison?

Rats the size of cats are invading our cities': Two-foot long giant rodents which are immune to poison are discovered feeding from bins in Britain

Britain set for 'super rat' plague as millions of 2ft long rodents 'immune to poison' blossom - Mirror Online

Is the super rat on the rise?

Rise of the Super Rat - How to Tackle Pests Immune to Poison