Heimskringla Shapeshifting

Óðinn changed shapes. Then his body lay as if it was asleep or dead, while
he was a bird or an animal, a fish or a snake, and travelled in an instant to
distant lands, on his own or other people’s business. He also knew how to
put out fire or calm the sea or turn the winds in any direction he wished
with words alone, and he owned a ship called Skíðblaðnir, on which he
sailed over high seas, but it could be folded together like a cloth.


- Heimskringla, Ynglinga Saga, Chapter 7