Alberta is advertized as a rat-free province- false, they are common in the eastern boundary area.
I saw an article that said the rat population in New York City far exceeds the human population. I know that is true of San Antonio, where we often saw them. One bar in particular (no, they were not pink). where they did a tightrope act on a molding near the ceiling.

Mostly "field" mice here in Calgary, no rats. We have a population living under the back deck. White foots, subsisting partly on seed dropped from the bird feeders. They get in the house occasionally and we have to set traps.