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Alberta is the only province in Canada—as well as one of the few places in the world—that is free of Norwegian rats.[51] Since the early 1950s, the government of Alberta has operated a rat-control program, which has been so successful that only isolated instances of wild rat sightings are reported, usually of rats arriving in the province aboard trucks or by rail. In 2006, Alberta Agriculture reports zero findings of wild rats; the only rat interceptions have been domesticated rats that have been seized from their owners. It is illegal for individual Albertans to own or keep Norwegian rats of any description; the animals can be kept in the province by only zoos, universities and colleges, and recognized research institutions. In 2009, several rats were found and captured, in small pockets in Southern Alberta,[52] putting Alberta's rat-free status in jeopardy.
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