According to Norse mythology, the immortal squirrel Ratatoskr runs up and down the world tree Yggdrasil.

According to Norse mythology, the immortal squirrel Ratatoskr runs up and down the world tree Yggdrasil. He is delivering messages (often insults) between the huge eagle who sits at the top of the tree and the dragon Níðhöggr, who dwells beneath one of the roots.
Jarle Nystuen

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