[rexarex]

The province of Alberta in Canada is famously rat free. They stopped the spreading westward wave of rats in the 1950s and have maintained this status.

https://dailyhive.com/vancouver/alberta-rat-free

https://amp.theguardian.com/world/2018/nov/15/alberta-rat-ca...

https://www.alberta.ca/albertas-rat-control-program.aspx

[ledauphin]

this is really interesting. i would have assumed poison would be a major factor in control, but at least on the government website that is not suggested to be the case.