The Japanese otter, Lutra nippon, is a carnivoran of the family Mustelidae. As the specific name suggests, it was once widespread throughout Japan. Perhaps due to habitat destruction or reduction of its food sources, it is now extinct. This otter population is considered by the IUCN to belong to the widespread Eurasian species Lutra lutra.
- Wilson, Don E.; Reeder, DeeAnn M., eds. (2005), Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed), Johns Hopkins University Press, http://www.bucknell.edu/msw3/browse.asp?s=y&id=14001124, retrieved 14 August 2009
- Ruiz-Olmo, J., Loy, A., Cianfrani, C., Yoxon, P., Yoxon, G., de Silva, P.K., Roos, A., Bisther, M., Hajkova, P. & Zemanova, B. (2008). "Lutra lutra". IUCN Red List of Threatened Species. Version 2009.1. International Union for Conservation of Nature. http://www.iucnredlist.org/apps/redlist/details/12419. Retrieved 15 August 2009.
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