Every so often I'll mention online that Alberta has no rats, and inevitably there will be an American responding in absolute disbelief saying I'm full of shit. I may not live in Alberta, but luckily rats aren't really a thing in my neck of the woods. Travel an hour down the highway and it's a different story. Also, as an aside, people often don't believe me when I say I've never seen a cockroach before in my life. No…
"Alberta has no rats" is a bit of a simplification, as the linked article goes into in depth. They do find rat investations (typically) in the border zones, and some sneak through, both wild and domesticated. Due to ongoing management though the statement is true in broad strokes. We have lots of mice and all sorts of ground squirrels (including a ridiculously awesome "museum") but thankfully very few rats.