I'd take a snake, but it's probably too cold in the PNW for them to survive outside where I need them!
Dang thing is fat off chicken feed... however, is not the biggest one I have seen. The largest rat I've seen was in an alley way down near 4th street in Seattle. Freaky thing was the size of a small cat. Body was as big around as the trap I am holding in the pic. You'd have sworn it was a possum if you hadn't seen many possums. Dang rats probably just eat the entire rat zapper before they could fit their head inside.
Cat's must have taken out all the mice, don't think they wanted to deal with these rats. If you stomp one, do it very fast and very hard. They really are tough.