What countries do flying squirrels live in?

Mostly Montreal they are every were in Montreal
The Grey Squirrel (Sciurus carolinensis) is native to America and Canada, but has been introduced to other countries, often with disastrous results for endemic species, such as the Red Squirrel in the United Kingdom. The Grey Squirrel is a prolific, adaptable animal, that usurps the territories of less aggressive species occupying the same niche.