More than once they had smelt that dreaded destroyer of the north that men call the Gjerv or Wolverene; and one day, as this danger-scent came suddenly and in great strength, a huge blot of dark brown sprang rumbling from a rocky ledge, and straight for the foremost the White Calf. His eye caught the flash of a whirling, shaggy mass, with gleaming teeth and eyes, hot-breathed and ferocious.