My three Siamese cats do wonders with the control of rats. We live in rural Norfolk, and last year a colony of rats began to be a problem, stealing the bird food and getting into my neighbour's house. I love all wildlife, but rats carry some very nasty diseases. During a two week period, nearly the whole colony was killed off. My two smallest cats were seen carrying a rat one at each end, like two men with a stretcher! They kindly brought the tails indoors, presumably as a gift.