From Norse Mythology, Ratatosk is the squirrel that runs up and down the world tree Yggdrasil.

One translation reads...

"Ratatosk the squirrel is called which runneth
about the ash Yggdrasil:
the warning words of the watchful eagle
he bears to Nidhogg beneath."

Other interpretations have him carrying news and/or insults from the great dragon Nidhogg to the eagle and hawk above.

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