The Yosuzume, or night-sparrow, is a yōkai from Japanese folklore. It appears as a bird with a sparrow-like call. It appears at night to harass people who walk along mountain trails after dark. It is possible to be possessed by the Yosuzume, though a particular chant can avert this.
In some parts of Japan, the Yosuzume is a butterfly not a bird. Other variants herald disaster, or are accompanied by dogs, wolves and other yōkai.
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