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The article describes a study which focuses on the invasiveness and evidence of breeding by house mice in an urban area of Yukon. It suggests that the mice are native to northern India and have migrated to various parts of the world because of human activities. As suggested, the study included mice, which were collected from occupied buildings and outside near unoccupied buildings in Whitehorse and highlights that the mice population consists of two color variants. The article also confirms their existence in cold climates and locations at higher altitudes. It also suggests that the introduction of these mice in Yukon is through unintentional human transport including shipments of food and other goods.

The article presents a study investigating on the first record of a brown rat or Rattus norvegicus from the Yukon . It was on July 9, 2010 that researchers have captured a female brown rat in an interior of an occupied house in Whitehorse, Yukon. The captured rat was identified as a brown rat than a black rat or Rattus rattus by its characteristics such as in the head, tails, and its small ears covered with fine hairs. Moreover, the origin of the specie was unknown but is was believed to have been transported by humans from either the Alaskan coast, the inland routes from central North America, or it may be an escaped pet.