Mononoke

Occasionally, very old trees will bleed when cut, and this is regarded as a sign that a kodama is living inside. Cutting down such an ancient tree is a grave sin, and can bring down a powerful curse, causing a prosperous community to fall into ruin.

- Meyer, Matthew. The Night Parade of One Hundred Demons: A Field Guide to Japanese Yokai (Yokai Series Book 1) (p. 35). Matthew Meyer. Kindle Edition. -