For those who know about these things,
@Reynard in particular, how big are rats?
Bob caught something yesterday evening. The victim is usually a tiny mouse. Last night's catch was large. How big is the biggest mouse and how small is the smallest rat? I would say it was a rat. The body was about five inches long (and very fat) not including the tail, which was another four inches long.
There is a massive field at the end of my garden, and a very wild overgrown area about thirty yards away. I am not surprised that there are rats there, but this is first time he has caught a large one.
The carcase was moved from the back door step to the edge of the field. A fox, snake, or a raven might have had an unexpected snack last night.