Since the ’50s, Alberta has engaged in a deliberate effort to prevent rats from entering the province. Fortunately, rats can’t survive in the wild in Alberta, so they have pest inspectors regularly check every premise within a 29 x 600 km control zone from Montana to Cold Lake. Pet rats are illegal.
The rat-free status of Alberta led to a Wikipedia edit war over whether the province should appear on a map of the brown rat’s habitat. At some point it was decided to remove the map entirely from the English-language entry for Rattus norvegicus, but its presence on other Wikimedia projects means the edit war still rages on to this day.
