Yggdrasil
Níðhöggr (Old Norse: Níðhǫggr - “Malice striker”), a massive dragon/serpent-like being that gnaws at its root(s), an unnamed eagle, and the hawk Veðrfölnir (Old Norse: “wind bleached” or “wind-witherer”), who sits between its eyes, along with the four stags Dáinn, Dvalinn, Duneyrr, and Duraþrór.