In our successful attempt to create a garden to attract wildlife we have an unwelcome visitor, a rat. He/she is very at home, log piles for shelter, a pond to drink from and, no mess bird food offerings that have been dropped from the bird feeders. We have tried a sensor that emits the noise they are supposed to dislike, either it doesn't work or the rats deaf! I'd rather not use poison, it's cruel and we have 2 greedy labradors. Has any one successfully driven out rats from the garden with a sensor? I'm getting desperate to be rid before it multiplies!