Baree, like the young wolf seeking new hunting grounds, or the young fox discovering a new world, had no reason or method in his wandering.

He was simply "traveling"-- going on.

He wanted something which he could not find.

The wolf call brought it to him.
The stars and the moon filled Baree with a yearning for this something.
The distant sounds impinged upon him his great aloneness.

And instinct told him that only by questing could he find.