The blue spot in Canada is the Alberta province. In the 1950s, the local authorities implemented a rat population control program: a perimeter was closed off and there were special people that spread the rat poison. And even if rats do find a way to get into the territory of Alberta, they won’t be able to find a warm place for a comfortable life because of the low temperatures and low population.

It is known that in 1959, 600 rats were found and killed and in 2007 only 2; and in 2014, only 4. And in 2003 and 2016, there were no rats at all.