A Yamabiko (山彦 , yamabiko lit. Mountain Echoes or 幽谷響, lit. Echo) is a Japanese creature. A spirit that mimics sounds in the mountains. When someone shouts in the mountains, the yamabiko would reply with a great cheer. However, these days, people doubt their existence and believe that the voice they hear replying to them is just their voice naturally reflecting back to them.
- Example: Kyouko Kasodani
- Wikipedia entry for Yamabiko