Kodama (spirit)

"Kodama" (木魅) from the Gazu Hyakki Yagyō by Toriyama Sekien.

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".