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A Sumo Wrestler's Tail (ちゅうずもう) is a Japanese animated fantasy short film directed by Akihiko Yamashita and written by Hayao Miyazaki made for the Studio Ghibli Museum. It premiered at the museum in 2010.
Miyazki based the story on the Japanese folk tale Nezumi no Sumo (ねずみのすもう).
Chu Zumo is the story of an old farmer who discovers a group of rats heading to a sumo wrestling bout. After they lose miserably he decides to feed the rats to boost their chances of winning.