Kappa (folklore) VS World tree

Kappa (folklore)
A kappa (河童, river-child)—also known as kawatarō (川太郎, "river-boy"), komahiki (駒引, horse-puller), kawatora (川虎, river-tiger) or suiko (水虎, water-tiger)–is an amphibious yōkai demon or imp found in traditional Japanese folklore. They are typically depicted as green, human-like beings with webbed hands and feet and a turtle-like carapace on their backs. A depression on its head, called its "dish" (sara), retains water, and if this is damaged or its liquid is lost (either through spilling or drying up), the kappa is severely weakened. The kappa are known to favor cucumbers and love to engage in sumo wrestling. They are often accused of assaulting humans in water and removing a mythical organ called the shirikodama from their victim's anus.
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World tree
The world tree is a motif present in several religions and mythologies, particularly Indo-European religions, Siberian religions, and Native American religions. The world tree is represented as a colossal tree which supports the heavens, thereby connecting the heavens, the terrestrial world, and, through its roots, the underworld. It may also be strongly connected to the motif of the tree of life, but it is the source of wisdom of the ages. Specific world trees include égig érő fa in Hungarian mythology, Ağaç Ana in Turkic mythology, Modun in Mongol mythology, Yggdrasil in Norse mythology, Irminsul in Germanic mythology, the oak in Slavic, Finnish and Baltic, Iroko in Yoruba religion, Jianmu in Chinese mythology, and in Hindu mythology the Ashvattha (a Ficus religiosa).