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It is believed that Kallikantzaroi stay underground sawing the World tree, so that it will collapse, along with Earth.
In both the Poetic Edda and the Prose Edda, the squirrel Ratatoskr carries messages between the unnamed eagle and Nidhöggr, the wyrm that resides below the world tree.
According to Fjölsvinnsmál, Víðópnir or Víðófnir (Old Norse, possibly "wide-open" or "wind-weaver") is a rooster that sits at the top of Mímameiðr, a tree often taken to be identical with the World Tree Yggdrasil.