For she knew that in the lynx's lair was a litter of kittens, and she knew the lynx for a fierce, bad-tempered creature and a terrible fighter.

It was all very well for half a dozen wolves to drive a lynx, spitting and bristling, up a tree; but it was quite a different matter for a lone wolf to encounter a lynx--especially when the lynx was known to have a litter of hungry kittens at her back.
But the Wild is the Wild, and motherhood is motherhood, at all times fiercely protective whether in the Wild or out of it; and the time was to come when the she-wolf, for her grey cub's sake, would venture the left fork, and the lair in the rocks, and the lynx's wrath..