Just a minor error;
A word is missing, "leopard" being the one I believe. It's missing after "gigantic":
"A growl came from the snow-fog behind her, and from it burst a gigantic . Twice the size of a bull caribou, it fell upon Koomuk, who shrieked as it clamped its jaws around his skull."
Not sure a whole new post was required to point this out. 