https://en.m.wikipedia.org/wiki/Kodama_(spirit)
Kodama (木霊, 木魂 or 木魅) are spirits in Japanese folklore that inhabit trees. The term is also used to denote a tree in which a kodama supposedly resides. The phenomenon known as yamabiko, when sounds make a delayed echoing effect in mountains and valleys, is sometimes attributed to this kind of spirit and may also be referred to as "kodama".
