In her day she was an incredible ratter. We had a rats nest under the shed. They set up home because our neighbour had an aviary, and the rats were after the roosting birds.
I bought a rat trap - a huge back breaking sort. Baited it with chocolate and waited. Next morning, trap tripped, chocolate gone, no rat. I eventually bent the mechanism to operate on a hair trigger, if you sneezed it would trip. Next morning bait gone, trap tripped, no rat. Those buggers are clever - they must have used a stick to trip the trap. I had no idea that rats were tool users.
The guy next door tried a humane trap; all he caught was a hedgehog.
Then Cleo got on the case. Worked her way through the lot of them. Of course they fight back, so she'd come in really proud with tail high looking a bit battered, and outside a half eaten rat. She got all five of them. She was a quite small cat, but a scourge of rats!
And voles, and mice, and birds etc etc. Many brought back alive as a trophy to try to teach the higher primate chimp owner how to kill a small animal.