Tsuchinoko

The tsuchinoko does not have a canonical cosmogonic origin in the provided sources; it is presented in vernacular Japanese folklore and modern cryptozoological discourse rather than as a deity or classical yokai with a literary origin. The name tsuchinoko (ツチノコ, 槌の子, literally glossed in sources as "child of hammer") is widespread in western Japan (Kansai and Shikoku), while a regional variant name bachi hebi (バチヘビ) appears in northeastern Japan. Contemporary history of the creature includes late‑20th century waves of reported sightings, organized expeditions and municipal bounties (notably a 1988 Shimokitayama expedition), and 21st‑century popular‑culture reuse (models, fandom entries, parks).

Described as snake‑like and between about 30 and 80 centimetres (12–31 inches) long, the tsuchinoko is notable for a central girth much wider than its head or tail. Some accounts include fangs consistent with descriptions that their venom resembles that of a viper. Modern visual representations (models, 3D prints, and media adaptations) exist but are contemporary renderings rather than primary traditional descriptions.

Reported traits include fang‑delivered venom likened to a viper's, an ability to jump up to roughly 1 metre and perform a second jump while still airborne, and the folkloric claim that it can sometimes swallow its own tail and roll like a wheel (a behavior compared in sources to the American "hoop snake"). Some legends assert that certain tsuchinoko can speak, have a propensity for lying, and show a taste for alcohol. Human responses recorded in sources are principally investigative or civic (hunting, expeditions, municipal bounties) rather than ritualized confrontation.