When I gutted a Rainbow from my club reservoir today I was surprised to find a partly-digested black rodent in it's gut!
I say 'mouse' but I suppose it's more likely a Water Vole. The front end was mostly mush but two back legs and a shortish tail were definitive evidence of rodent.
My wife screamed until it was bagged and binned so I can't offer any photographic evidence, I'm afraid. It did whiff a bit too!
I've seen video-clips (on here) of New Zealand rainbows being caught on mouse patterns. I've already started studying deer hair mouse patterns, but with a size 10 hook limit it will have to be baby mouse, rather than full sized Vole.
For the record it took one of my "Egg Hog" Sedges, fished static.
SharkeyP