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In page Otter:

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In the Ishikawa and Kochi Prefectures, they are said to be a type of kappa, and there are stories told about how they engage in sumo with otters.[2] In places like the Hokuriku region, Kii, and Shikoku, the otters are seen as a type of kappa.[8] In the Kagakushū, a dictionary from the Muromachi period, an otter that grew old becomes a kappa.[9]