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Rattus norvegicus

Basic information
Scientific name Rattus norvegicus (No picture)
Common names Norway rat, brown rat
Higher taxon Muridae, Rodentia, Mammalia
Natural range Assumed to be SE Siberia, N China, and Japan (Honshu, Shikoku, and Kyushu).
Habitat In urban area, this species prefers wet habitat such as sewer, kitchen, gabage station, underground mall, food storehouse, etc. This species also occur farm area.
Invasion information
Range in Japan Many peripheral islands. Although mainland populations are assumed to be natural, those can also be mixed with introduced population. Range in Japan
Origin Unknown.
Date Unknown. Introduction to Ogasawara (Bonin) Islands might occur in 1670-1862.
Route Accidental: Hitchhiking on some transport.
Impact Predation. Damage on agriculture. Carrying parasite (e.g., harvest mite).
Native organism(s) affected: Sea birds breeding on small islands. Crops.
Regulation in Japan No action for prevention, mitigation, control, or eradication.
Introduced range in other countries Worldwide
Reference Notes
  • Abe et al. (1994) A Pictorial Guide to the Mammals of Japan. Tokai University Press, Tokyo. (in Jpn)
  • Kawamichi (ed) (1996) Encyclopedia of Animals in Japan 1, Mammals 1. Heibonsha. (in Jpn)
  • Long (2003) Introduced mammals of the world: their history, distribution, and influence. CABI Publishing.
  • Nakamura (1988) Alien Animals of Japan. Kanagawa Pref. Mus., Yokohama (in Jpn)
  • Nakamura et al. (2002) A Survey on Leptospiral Reservoir Animals in Okinawa Prefecture. Ann Rep. Okinawa Pref. Inst. Health Env. 36:39-42. (in Jpn, Eng abstract)
  • Wilson & Reeder (eds.) (2005) Mammal Species of the World. A Taxonomic and Geographic Reference (3rd ed), Johns Hopkins University Press, 2,142 pp. (
  • Yabe (2006) “Water rat” of Ogasawara. Annual Reports on Ogasawara Research, Tokyo Metropolitan University. 29:19-22. (in Jpn)
  • Yamada et al. (eds) (2011) Invasive Alien Mammals in Japan: Biology of Control Strategy and Conservation. Univ. Tokyo Press (in Jpn)