In tropical and desert regions, brown rat occurrence tends to be limited to human-modified habitats. Contiguous rat-free areas in the world include the continent of Antarctica, the Arctic, some isolated islands, the Canadian province of Alberta, and certain conservation areas in New Zealand.Perrow, Martin and A. J. Davy. (2002) Handbook of Ecological Restoration. Cambridge University Press. pp. 362–363. . Most of Australia apart from the eastern and south-eastern coastal areas does not have reports of substantial rat occurrences.
In tropical and desert regions, brown rat occurrence tends to be limited to human-modified habitats. Contiguous rat-f.ree areas in the world include the continent of Antarctica, the Arctic, some isolated islands, the Canadian province of Alberta, and certain conservation areas in New ZealandPerrow, Martin and A. J. Davy. (.2002) Handbook of Ecological Restoration. Cambridge University Press. pp 362–363. . Most of Australia apart from the eastern and south-eastern coastal areas does not have reports of substantial rat occurrences