Muskwa jumped and shook himself.

Then he listened.
A sound came to both of them.

In one slow, graceful movement the grizzly reared himself to his full height.

He faced the north, his ears thrust forward, the sensitive muscles of his nostrils twitching.

He could smell nothing, but he _heard_! Over the slopes which they had climbed there had come to him faintly a sound that was new to him, a sound that had never before been a part of his life.